Well as a judge myself I don't see anything wrong with it at all. However when I judge I first look for what I call the "Gotcha Factor" if it jumps out at me it's gonna get my attention. I pick out detail as well, like what you have in the engine bay. I'll also go by subject matter, if it's been scratchbuilt or not.
A lot of what you encountered with this build could of been the fact it didn't appeal to the judges so it got overlooked. The judges may have been into , say NASCAR and don't like the look of it and passed it by. I think a lot of times that happens and "some" cars don't get judged for what they are!!!