Steve,
Sounds like a great idea. I would be interesting in buying a jig, depending on the final price, of course.
In as much as this purchase is only done once, I would be interesting in having the jig done 'first class', with no short cuts, with all details finished as much as practical (with the exception of the base, which would be user supplied). I would have no objection to doing minor jobs like de-burring, etc.
Warren Wagner