I am now working on the design of one with a guy who I have bought many neon signs from. I never realized that he could custom make them also. Mine will have a red outer rectangular ring and a double-line Ford GT lettering with red inner pinstripe. About 16 inches tall by about three feet wide, and should complement my red/ white stripe GT well.
If it turns out as well as I think it will, then YES- I imagine others may want to contact this guy as well. When I have more info, I will post it up. It definitely will be cheaper to do multiple, as it will be $150 just to set up the framing for the first one. Overall though, this will probably be pretty darn inexpensive, as far as GT stuff goes. The other signs I have bought from him have all been cheaper than I expected. I'm not sure of the various neon color options, but I imagine there will be several choices.