I didn't use any pre-made parts, so that probably helped.
I clicked 'submit' on Dec 7th, 2022. Mailed my prints on Dec 8th and they arrived at ATF on Dec 12th.
The approval email was sent at 6:06 AM on Dec 17th, 2022. (last Saturday)
These are the pics I sent--I put on the application that 'raw barstock to be turned on lathe only after F1 approval'. My 'plans' are only slightly better than a napkin doodle and Mr. Seleski would have given me an 'F' in 7th grade shop class--I didn't even bother to use a ruler for straight lines.
I either had a very generous examiner, or some folks are overthinking the requirements.