Fine looking MG!
"two domed crystals ( very similar to my original 6538 crystal) but these have a metal retaining ring on the inside edge. Did not fit the case with the ring installed, removed the ring and the crystal fit the case. slightly smaller on the outside diameter so bezel is not a snug fit. Added some dial dots for extra security and it seems good.....might replace the dial dots with clear silicone."
The 'gap obsession'...
I know what you mean about 'the gap' around the outside of the dial. I did a '5512' project a few years back using a DW case, 1570, and Yuki dial. The case was made for 26.5mm dials so there was a very small gap around the OD of the dial and only the dial foot screws were holding the dial down. I made a very thin spacer out of aluminum to fill the gap and felt better about it...until I read later that a few of the earliest 5512 watches had the gap because they were using leftover dials with a smaller diameter than needed.
Speaking of 'the gap',..here is an example of an early 5512 with the gap and without the SCOC blurb that came later...
Rolex Submariner Eagle Beak Tropical Dial Ref. 5512 - Rolex Passion Market