Right now the design is mostly made on autocad, but I have started mocking up pieces in bristol board (old school yes I know) but thanks to CCFiero, he's great with Solid edge and is also helping me out with some 3D renderings as well. Still gotta work out a couple issues with my flat design so that I can close up some gaps, I think the design is coming up nicely, the main side rails are mainly made out of 2 pieces of 0.120 thick mild steel, when all bent up the two pieces will come together and create a single rail piece.
Anyways onto a few pics, also shown is the autocad flat design to show how interesting the pieces are before bending.