I have also heard FEL builders refer to a form of CAD known as Cardboard Aided Design. A few nails for pivot pins and some packing tape and you can have a pretty good idea in an afternoon.
Biggest advantage of using wood or cardboard is you don't have to build your whole darn tractor on the computer first to see what will fit.
Biggest advantage of using wood or cardboard is you don't have to build your whole darn tractor on the computer first to see what will fit.