Steve,
I haven't done anything as to that on the Briggs yet either. My choices are either billet or formed and solderd brass sheet 0r possibly fiberglass but that would require a mold or a form and I want to do something that others could more easily duplicate if they so desired.
I am fortunate in that we have 2 3D printers in the RP lab which falls under my area. In some cases to finish out a material cartridge, or otherwise "test" one of the machines, I will run something useful even if somewhat personal. IIRC the direct material cost was something like $15 and at 1/3 scale like your model even less. As long as you can draw it in 3D and save it as an .stl file it can be run. When you get to that point let me know...I may be needing to do some more testing. I find that the commercial sites are still really costly especially for one offs.
The beauty of the process was that I ended up having to scale up the drawing by 1% which can be easily done on the RP machine without having to modify the drawing itself. While 100% was tight 101% fit like a glove!! Contact me offline when the time comes.
Bill