Also, if you're printing in ABS, make sure you can print in black as it is the most UV stable for outdoor use. Shapeways does a good job of quick turnaround on printed parts, and they do a number of different materials, including stainless steel. I have used their "strong plastic" on several parts and it has a lot of give which may work better for a snap-in piece like this trim clip seems to be.
pressingonward, what do you do? It's always fun to find another CAD geek. I am an Industrial Designer, used to work for a sports equipment manufacturer in MI, then moved to CO a year ago and now work from home. (I don't want to hijack this thread, message me any reply)