Start it here in General Chat, or Technical would also work, given the apparent range of modifications your car displays thus far.
If and when Cliff deems it meets the criteria, he will move it to the Construction Zone.
At least that's the way I think it works.
Would really like to see it somewhere if you decide you feel like taking the time and effort. Really like the way it's going so far, judging from the few pics I've seen.