Case arrived along with a 2nd "revised" DHGate Moonswatch. They have changed construction on the newer versions. Dial print seem crisper, new strap is considerably nicer, and there is now a metal plate covering the movement upon taking the plastic case back off. The metal plate has some heft so i'm not sure what practical purpose it serves other than possibly making it feel heavier? I'm not sure what gen weight is compared to the reps.
Anyway - still waiting on another PE50 movement so I can cut a new stem to legnth. But this stem my case I got was not able to be reused as the legnth is too short. But if you're trying to remove the stock crown from the stem I used some delrin tipped pliars to get some purchase on the stem without damaging the threads and it came right off. Wasn't glued on as others have reported on theirs. If you don't have similar pliars I suspect wrapping some electrical tape around a pair of needlenose pliars should work just fine.
Still have to fashion a holder for movement, cut new stem to legnth, and mount the bezel (it's not attached from the seller and 3m pre-cut tape is provided.) Pic just shows a rough mock up of a "mission to the moon early rep version" in this 40mm case:
https://www.aliexpress.com/item/3256804707033900.html ("case 1" - black) for 27.00.
Hopefully I can make it all work - I think it's a fun little project. About 60 bucks all in for parts (assuming you put it on a strap or something and don't get a bracelet).