The 3D model is looking great!
I hate to be vague about this especially after the whole "mystery chunk" discovery debate, but I've already identified the slide switch and the other metal greeblie inside the top recess. These pieces and other prop parts will be revealed eventually on The Parts of Star Wars Facebook page.
I'm speaking up now because I see you're wasting money on record players and real measurements might help with the 3D model.
The slide switches are not from any consumer electronics device. I wish they were as they'd be easier to find. After months of trying to get any that I can, I've only found 4.
Thankfully, the other greeblie is still produced and cheap although they require a minimum order of 400 and they're on backorder until November.
The only unknown pieces, besides the body, are the two pieces above and below the V8 gear.
I feel like the dome-like top piece looks like a nail on furniture foot, but I have not found a match.
The piece underneath seems like a Michell piece but doesn't match anything I have on hand or seem to match anything I have photos of.
Chris