Voilet,
I feel your pain. My first attempts trying to make a tag board stencil to fit into the stringers and then copying the stencil onto a piece of wood and making it fit was a complete failure. So I threw that system (along with a couple chunks of wood) out.

If ever I had a streak of genius (Okay, just dumb luck) it was that my building schedule was one week behind Bill’s. So Bill would hit a building crux. A big discussion would take place on BBS. Bill would have a wonderful solution. And I’d have a fix before the problem happened on my boat. Thanks Bill. Who ever said there’s nothing good about being second?

So here’s my system based on bill’s system:
I have a box of 500 tongue depressors that I got from Raka. So, I took a piece of cardboard (because it is thin. A thin piece of plywood would work better), and set it under the stringers. I cut off the round part on the end of 3 tongue depressors and butted each tongue depressor up against a stringer. I then taped the tongue depressors to the cardboard. I also placed a short piece of wood against the inside of the outer stringers and drew a line onto the cardboard with it. This gave me my basic template. Sorry if that didn’t make much sense. I also when laying the stencil out on the floor board compensated for the initial stringer thickness by laying a short stringer section down on the board.

Well anyway, now I‘ve got an excuse to buy a scanner cause this would be a lot easier to explain with a drawing.

Here are some hints that do make sense:

• There's no reason to scallop the undersides of the floorboards. Looks cool when you’re building, but no one will see them in the end product.
  
• Start with the middle floorboards and work your way toward the ends. The very end boards are difficult so this will give you lots of practice.
  
• Cut a little big. That way you can sand down to size. I used a 10” disk sander with coarse grit, but a smaller one would have worked just as well. All my compound angles at this stage were completed using a sander.
  
• Make a “V” shape on the top of your floorboards where the cockpit is. This will help drop the center of gravity in your boat. Mikes picture is a good example.

Sorry about the befuddled writing manner. Just remember, this is the most challenging part of the Walrus. The rest will be a breeze in comparison.

Roger