Nice Build! And nice modifications!
I have found many Monogram big scale kits lack parts, they have even fewer parts than the 1:24 counter part. I am glad we have 3D printers today!
I have seen that kit recently when i bought it for my friend that have a 1:1.
His thought was to use the body for a 1:8 RC car.
His 1:1 is heavily modifyed with a LS2 and T56. Half cage with lower bars and race seats. Body have been repainted in a pure white collor (without yellow) but with a clearcoat with silver and orange pearl.
Today he run Track tires on all 4 corner on "17 original GM five spoke Grand sport wheels from c4 which are light. He also have a set of the light weight Y2K wheels. He also changed the original hood louvers to the aftermarket ones that are funktional.