Here's what I have for the wheel hub cap emblem...I this one we can do without the background fill-in.
Hey AG, I actually know of a place in SF bay area that could do 3D printing of these parts.....check out
www.protocafe.com
I use them for prototyping for work...but the way the make these prototype (for fitting purposes of course) it's like 3D printing and it only takes a couple of days or less turn around time to make these models. But if we're making it out of machining, going this path does necessary mean we can machine it.
PS> I sent you the file for the Wheel Hub Cap Emblem too...it's a draft