"I have access to a machinist..."
One point you need to be aware of. If you get a Form 1 approved to make a suppressor, YOU must make it. You cannot hire it out, or have someone else do it for you unless he has a Type 7 FFL and a Class 2 SOT (manufacturer of NFA firearms); if he does, then the transfer to you is on a Form 4 with tax.
Your machinist could probably advise you as long as he took no substantial part in making the suppressor. (He could show you how to run a lathe, as long as he didn't demonstrate by making a part for the suppressor.)
Jim
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