bill,

statements like these make me wonder if you've ever used CAD software before.

Crunching numbers? with CAD you can crunch the numbers and have the results graphically interpretted instantly.

Change the dimension of the beam, and if its scaled properly in the drawing, it will scale the rest of associated dimension to match.

I mean, aircraft and automobile designers rely on CAD to do their calculations for them, I can't imagine a boat designer couldn't.