Depends on what you use for an engine and what other goodies you intend to use.
Get some seven core for the rear lights and use trailer wiring code,and a few rolls of different coloured wiring and lay it out where it needs to go and Bob's your uncle,or nearly .
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.