the only problem with that online machine shop is their proprietary software. I use Autodesk Inventor (autocad) and it doesn't port over very well. I tried to do a set of TVP's for my savage and after 1 week of tinkering just to get the program to accept the design it woudn't even let me choose a decent aluminum/carbon fiber material to machine it from.
i have access to a machine shop, we do most of our design work in autocad and then save it as a DXF file then it imports nicely into our waterjet software OMAX
We also have a CNC mill and would be glad to help out anyone who needs it. If you can cover our costs I'd be happy make what I can. We can read most any file format.