Great work! Love the attention to detail. I'm impressed you even attempted to do the engine bay--there's a lot going on under the hood of any car! I haven't attempted to do a full engine bay drawing in a long time...
I also know how you feel about redesigning a car...designing cars is a long and tedious process. I feel that I learn from each attempt to design a car and improve upon it in the next iteration. Eventually, you reach a point where you don't want to change anything!

I may have reached that point. I feel like I've gotten the car correctly put together concerning legality and classification. I've had a recent change of the rotary engine's bay, and I've slimmed down the body. I don't seem to have any changes left. Thanks for the appreciation X3!