Go for steel and there is not a lot of need to beef up the design except for replacing with 25x50 the bits that are doubled up 25x25.
Ally chassis,nice idea,mega money.
Cost : Little as possible.
Thanks : To those who by their generosity my build has progressed.
Its a handmade sports car not a flaming kit car !!!
If at first you dont succeed,avoid skydiving...
No parachute require to freefall,only if you want to do it twice.