McLaren MP4/6 (1)
I first got the idea to build a Formula One car of the pre-1994 era after coming up with the front steering/suspension solution that you see here. I built it using levers, 4mm pneumatic hoses, and minifig hands.
This build came together relatively quickly - about 3 weeks in I had finished the entire car except for replacing the placeholder pieces with the correctly colored ones. Overall it was a fairly straight-forward car, although the side pods were quite tricky, due to the three stud sideways high arrangement. Because of this, the top parts of the side pods (the plates) as well as the airbox had to be offset by 1/2 plate to avoid gaps.