If you're at all handy with 3D drafting tools, you can have the most amazing objects printed for you at Shapeways. Above is just one example, a cockpit for a P-51 Mustang.
You can print in a wide range of materials, from flexible plastic to stainless steel. And it's remarkably cheap, usually around $2-$3 per cubic centimeter.
Shapeways can accept output from many 3D authoring tools, but I prefer Alibre, which is designed for physical objects and is affordable ($99). Lots of people use the free Sketchup, too, although because it's designed for virtual objects it can be a little tricky to ensure that your design will print properly. Others use everything from Blender (open source, crazy hard to use) to Solidworks ($5,000!).
Here's another example: an EasyStar FPV cockpit mount that Jason Short designed and 3D printed. Pretty cool, huh?
Coming out of the 3D printer: