This is meant as a running compilation for model builders. (And real boat builders for that matter.) The more who contribute, the better... Here goes.
Below are two of my better models, the Car Topper and the Diablo. (Both look far better in real life than in the picture...)

Beginning thoughts...
* Choose a scale and stick with it. For help with the math, see other posts here or just ask.
* Follow Dynamite's instructions to the letter. I've been messing with these designs for 30 years, and every time I think I have Payson/Bolger outfoxed, I get my clock cleaned. There's so much wisdom in Dynamite's instruction it's not even funny. If you think you have a better idea, build a model first.
* Model making doesn't have to take a lot of time. I think of it as a "commercial-time hobby". That is, when there's a commercial break at night, I spend just a few seconds cutting out a frame or mold.
* Experiment with yellow glue, quick-setting epoxy, CA, and hot melt... Each has its place.
* The devil is in the details. Get used to working in hundredths of an inch, and fractions of a degree in angle, at least at the scale I use (1:27). This sounds fine, but so long as you can cut a straight line with scissors or a razor knife these tolerances are simple.
* Repeat the following mantra "
centered, plumb, level, square" over and over again.
* From now on, I'm just going to shrink the plans to fit my scale, then glue them onto my material, and cut them to shape...
* I've tried everything to hold parts in place for gluing, and nothing works like scotch tape. Not graceful, but it works.
* Make notes as you go... What's tricky in the model build is probably going to be tricky in the real build.
* When you're done, don't just plunk your model on the mantle and forget about it... Make a scale model of yourself and your gear. I used pipe cleaners and hot melt glue (gee, I'm not fat anymore...) See how all will fit. Do you like the deadrise? How about the sheer? Is there enough freeboard? Even a rough model speaks volumes.
Looking forward to other contributions...
Alan