The work, and the quality of that work in that thing blows me away. I must say that I question some of your building decisions, because I feel that the kit parts looked better, styling-wise, than your scratchbuilt pieces. For example, I just don't get those headlight doors - they're not exactly aerodynamic, and don't really flow with the bodylines.
All that being said, this thing is a trophy-winning machine! Out-of-scale details or not, the amount of details and the high quality of the work/engineering you put into them is amazing.