That's what DPcars did on the actual bodyplug. he hired a company who opperate a HUGE portal type 3d mill to make boat hull plugs, could be quite expensive though.
Nice to make an RC of that small thing!
on the bodymounts,
I noticed the other day on a GD cobra that GD uses some thin (5mm) steel plates with a bolt cast on, that have a piece of rubber inside that again is vulcanised to another steel shim that has an m6 thread tapped inside about 5mm deep.
they bolt the plate into the chassis and bolt the body to that, the body doens't recieve the vibrations from the engine, but are apperantly quite strong, because the jack-up points on a GD cobra are the body itself not the chassis, never heard about problems with that. don't know what these thing are called though. they're not like the normal rubber bobins and very strong almost no play between both sides
Grtz Thomas