Local Motors
It's the site that drives the Local Motors company. You may have seen their creations somewhere, the Rally Fighter or the XC2V
Anyway the site is for all the range of car nuts, both amateur and professionals and they have organized design competitions from time to time.
I think it's a good place to make your game known and as such I started a thread about it over there.
http://forge.local-motors.com/pages/forum.php?cg=1993
Maybe if the reaction is very positive you could colaborate in some way.