Do any of you guys use computer programs similar to CAD or other engineering programs, to design your frames? Something that would allow you to view a frame before you commit materials to something you have never made before. I'm not a framebuilder (yet), but I wouldn't mind goofing around with such a program whenever it's too cold out to ride.
I just draw in 2D CAD. It's all that's needed for setting out designs on paper, but it doesn't give the virtual bike feel. On the other hand, I can build identical parts to the ones I am actually using, and it's free to boot.