Not ideal but works is beer gas Co2,independent beer sellers do them,about £12.
And lighting,look for LED lights about ,£16 and bright as hell.
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.