What kind of boat? Sailboat (smooth), power (with sharp corners), any particular max or min?
Also, I do not know what a 'step-format' is. Can you say what application you will us it in, or give th file types, etc.
Or, consider going to www.formsys.com
, search to get to their academic software section, where you can apply to use a student version of their hull design package. Then you have access to several types of models, and can make your own to make more challending tests for your device.