Did the research a year or two back. Making the baffles really isn't an item of concern. Practicing internal thread cutting on this machine is one of my first tasks, but I've already got a good grasp on how to do it. Honestly I don't see how the idea is silly... If you've got something specific you're thinking of please share your concern instead of just being snarky.
I'd probably try to center on the threads and not on the suppressor body for the boring operation. Barring that, confirming concentricity of the threads before I started (probably before even filing the paperwork) would def be necessary. Considering that many of the suppliers I've looked at claim to also make real suppressors of the same dimensions I'd expect that they should be fine. No way they have enough rejects to sell as fakes right?