Custom Design

Sometimes, you just can't find the boat you need. Perhaps you have an unusual combination of requirements. Perhaps you have your heart set on building your own, but none of the stock plans you can find are quite right for you. Perhaps you're looking to save money and/or get a better quality boat, compared to what you can find at brokerages.

All of these- surprisingly, even the last one- are good reasons to consider a custom design. It's a long and intricate process, of course, and not for everyone, but if the idea of a boat that is exactly what you need sounds appealing, then read on.

Custom design is not a full time job for me. It's something I greatly enjoy, and I have decided to offer these services, one boat at a time, to a few clients who need a passionate, capable designer to address specialized or unusual requirements. For the moment, I'm interested only in small craft: runabouts, landing craft, tenders, launches, dinks, even models. If your tastes tend toward the big and fancy, of course, I'd be happy to help you find a suitable match from among the ranks of other designers.

The Design Process

Rather than charging by the hour, I offer custom designs on a flat-fee basis, broken down into three stages of design development. You're assured of getting what you want every step of the way, and there is no commitment to continue if you decide to abort or pause the project partway through.

Concept Phase

To start the concept phase, we need to agree on the basis of the Statement of Requirements. The SOR should include details of how the boat will be used, what range, speed and payload/crew capacity you require, the sea states in which the boat is expected to operate, a summary of any required interior accommodations, and your preferred building location and methods. Your sketches, scribbles, and references to other boats you've liked are very helpful at this stage. I will produce preliminary designs based on the SOR, and will revise the general arrangement and hull design of the boat until you are satisfied. Minor revisions to the SOR may be made during this stage, as your requirements develop along with the preliminary design. But a major design change (“I know I said powerboat, but can we give it a mast and sails?”) means going back to the start.

At the end of the concept phase, the design documentation will consist of, at a minimum:

  • Three-dimensional hull and general arrangement model in Rhino/OpenNURBS (*.3dm) format
  • Rough weight estimate
  • Rough performance predictions

Preliminary Design Phase

When you are satisfied with the general arrangement and preliminary hull design, and we both agree that the preliminary design is appropriate for the design requirements. I will then proceed with the structural drawings and detailed arrangement plans, consulting with you as the design progresses to ensure the design is true to your needs. The main goal of this phase is to develop the design to the point where we can be sure it will work as intended, and where you can take the design package to builders and equipment suppliers for cost estimates.

At the end of the preliminary phase, your custom design will include:

  • Final hull lines
  • Preliminary structural drawings
  • Detailed arrangement drawings
  • Accurate weight estimate
  • Equipment specifications and necessary data for build cost estimating
  • Updated performance predictions

Details Phase

When you are satisfied with the detailed drawings and calculations from the second stage, we can move on to the construction drawings. This phase includes the final structural calculations, the electrical and mechanical systems design, and all the remaining drawings necessary to build the boat.

Deliverables from the final stage may include:

  • Final construction drawings and details
  • Final materials list and construction specifications
  • CAD files from which CNC cut files can be produced, if applicable. (Note that this is not the actual cut files, just DXF drawings from which they can be made. The metal shop should generate and check the cut files.)
  • Electrical schematics, if applicable
  • Mechanical installation drawings, if applicable
  • Plumbing drawings, if applicable

Drawing Details

All drawings and calculations will be in SI units, but if your material suppliers work in US customary units, I can prepare the drawings so that inch-standard sizes can be used. The 3D models will be in the OpenNURBS (3dm) format used by Rhinoceros 4. The intermediate and final drawings will be delivered electronically in PDF format. The cost of printing the large-format drawing sets is not included in the design fee (it's usually cheaper to have a local shop print them). If you prefer, the plans for smaller boats can often be prepared as a somewhat thicker set of A (8.5”x11”) or B (11"x17") size sheets instead of large format drawings.

Ownership of Design

As is customary in this field, the design copyright is the property of the designer, with the client having the right to build one boat (or sometimes several) from the completed plans. At a later date, I may offer a variant of the design to other clients as a stock plan. If you're planning to mass-produce the boat, additional contract terms can be negotiated as necessary.

Class Compliance

If RCD compliance or the approval of a particular classification society is required, this can usually be arranged. Compliance with a particular set of rules tends to be easier when considered right from the start; even so, fully class-compliant boats do cost more to design than boats that- although equally safe and seaworthy- do not carry bureaucratic approvals. Practically speaking, though, the sort of small craft I am interested in do not tend to require class approvals.


The details of the design contract should be discussed and formalized early in the process. Although I like to think that everyone is honest, truthful and agreeable, part of working in our society is covering one's backside and protecting one's clients. A formal design contract, explicitly spelling out what work is to be done and what deliverables will result, helps to avoid misunderstanings and boosts everyone's confidence in the project. Since these details vary from project to project, I won't bore the reader with intricate legal details here.


The design process will progress at the speed of money; in other words, each stage of the design will begin on receipt of payment for that stage. Even if you're not sure that what you want is possible, it might be worthwhile to go through the concept phase, just to see how your ideas pan out. There is, of course, no requirement to continue with further phases of the design if you don't like the concept. The design process can go as slowly as you desire, but cannot realistically be shortened to less than one month, even for a small boat.