"I would much rather see an aftermarket attempt to build a moment platform that:
1. Matches alignment with crown/tube holes
2. Accept genuine/aftermarket calendar wheels
3. Accept genuine/aftermarket hand size (and with an ETA Option)
4. Have a mounting system that leverages genuine case mounting (and with a case clamp option)
5. Has accommodations for Genuine or ETA dial feet, or Pie-Pan/6542/6538 dials
6. I really don't care about BPH. No one is fooling anyone anymore... "
I am with you 100% except on number 6.
Old model 10xx and 15xx rlx run at 18,000 bph and newer 15xx run at 19,800 bph. A vintage rlx project with a 21,600 bph ETA etc will pass the 'layman's sweep test'.
The higher grade cases and dials now available for vintage rlx projects are good enough to pass as genuine 80% or 90% of the time but a 28,800bph movement will not pass...imho.
"No one is fooling anyone anymore... "
I will admit fooling myself is not easy but slower beat movements seem to help...in some cases. pun for fun
One comment on using genuine rlx 15xx in vintage projects:
I have had my share of watches with rlx 15xx movements and will say they excel at one thing...they build running reserve quickly, maybe because of the low friction nature of the autowind assemblies. Otoh, ETAs do not seem to build reserve as quickly and china '21 jewelers' are duds in my experience. YMMV.