Hi
I am at home so the net is extremely slow but let me answer some issues:
Rhino is the software I use, but because of the way that I model , I use Solid Edge for "variable" fillets.
I create the surfaces ( Nurbs) then create a solid , I project the panel lines onto the surface and use the lines to cut the solid into smaller solids then I run fillet commands or bevel commands around the edges , then I stich them together - Simple Short explenation !
I use 3D Body Paint from Maxon to put the textures on!
Hope you can use it!
I can give you the long story if you need it?