I replied to a post and mentioned a Rangely Lakes boat I built for use in the lakes of Wyoming when we lived there.   Here's a bit more on that.   The Rangely boats were a design used in upstate New York as guide boats for dude fishermen who frequented the resorts.  These were rowed and they had flat-ish bottoms for stability for stand-up casting.  Back In The Day, they were caravel planked over steamed oak, or some were probably lapstrake.  I did mine using cold molded red cedar, two layers of 1/8 veneers with glass inside and out and some kevlar and carbon fiber behind a lot of the ostensibly wood interior battens and frames.   This boat was rowed by my wife and I for aerobic excercise...and I also designed it to sail using a Laser sailing rig.  It would plane in about 5 knots of wind.  The rig stowed under the rowing thwarts.  A fun boat for what it was designed for.

   I did my project design 'Old Style'    Carving a half model to get the lines right, then lofting it full size, building temporary frames for the lay up of the cold molding.  It was quite fun to build and I learned a lot..It performed remarkably.  Here are some pics of the half model that I took the lines from after shaping it how I wanted...This is the way all the oldtimers used to design boats (before computers)  

My model, I scaled at 1" to 1'.  I started by gluing  up 1" pieces of pine, then I carved the boat's shape and got it nice and smooth and fair...Then (way abbreviated explanation) you  divide the half model into Stations that will correspond with your temporary forms.  You can see some pencil marks on my model...I ended up spacing the frames at 2'2" I recall.   Then you use dividers to take the measurments at each 1" lamination at each station, which gives you what's called your "Table of Offsets"..or a bunch of points of measurement you then transfer onto the lofting floor, full size.

  Going from a 19" half model to a 19' real plan, that takes some patience, but it is really an art and quite enjoyable...Called "Lofting" and done on your hands and knees with long battens of straight grained wood, getting everything 'fair' before you actually begin shaping wood full size...

  Anyhow, here are a couple of snaps of my original half model...The boat is neglected in  our pasture right now because the Columbia River Gorge is NOT a place for a flat bottom rowing sailing dingy...