UObject free chaos body creation (mostly hardcoded as a dynamic body with no welds?). This does not call SetUserData as that requires a body instance

Thanks to vblanco for this fast transform setting trick According to him the first two steps (comp to world and updatebounds) can be threaded but not

@todo-karl: fix the implict object caching here

Sets default values

Called when the game starts or when spawned

This is just to double check my math works out, we don't need it at all.

todo-performance separate setup for rarely moving pieces?