I know this is an old thread but such a great thought, Mew.
A DIY mill or lathe is not all that hard to do and can build one to your size and power needs. Can even do a CNC but that is way beyond me.
I have 3-in-one machine I got on special for $800 and it is great but wish I had known how easy and cheaper it would have been to DIYit.
Cool thing I learned in school (for this stuff) 40 threads per inch = .025 of an inch. But you could easily figure out graduations with whatever thread count you use to move holders/tables. Or, use a cross slide vise for milling. https://www.google.com/search?q=cros...Q&ved=0CEsQsAQ
Really could do some cool stuff for very little.
A guy looked at my mill/lathe and said "the only machine in the world that can make another" Meaning with a mill and a lathe, you can make a mill and a lathe. I just thought that was profound. And purty dang cool.