I really love this idea, and I'm sure I'm going to make one.
But what struck me was how useful this swivelling-style base would be if I could pop it off the vice and clamp it to the vertical column of my existing bench drill press.
Then I put my workpiece in its drilling fixture/jig and put that in the clamp.
Then attach the clamp to the drill press to drill all the required holes, and then move the whole clamp to this printed tapping arm to tap them.
Magic!
The only trouble is that the support column on my drill press is 46mm in diameter... darn.
But I'll probably still make one. This is cool!



















