WHAT? Hours to render? For a game model? Sorry, but that needs to render in under a second or a bit more, not more then 2-3 seconds a frame. you dont need to be using MR or HDRI for that... software...

not bad at all! Looks really good. But I dont like the wheel area... I dont know why :p but excellent model :beer:

Heres what I think you should do.