- mild steel, needs plating or painting unless moly is used
- castings - someone needs to offer castings in the shape needed.
- structural shapes? Same as a casting - needs to be close what what is needed.
Items 2 and 3 would require more porting/finishing than sheet material. Plus it would weigh more, the racers enemy.

Plastic offers less protection from bursting in case of backfire.

Last edited by Transman; 06/16/18 04:35 PM.