Good progress Murray!
I've managed to avoid shell deflection hits on my optics so far (I think) by having my rail mounted higher than yours. Totally blocking the safety was avoided this way, except for maybe from the optic itself (i.e. depending if the AK mount or Draganov/universal mount was used as part of the optic assembly).
I had my safety lever moved to the other (right) side (like on the 858 series). If I would have known about
Claven 2's info on making the T81 safety into a 90 degree one sooner, I would have left it on the left side and extended the lever by about an inch--AND I'm sure it would clear the underside of a mounted optic-Oh well, next time!
I like your idea of the spacer plate, but wonder if aluminum is strong enough to hold a thread (?) for the bolts (?). Maybe mild steel would be better for a future attempt?
Anyways, my rail is of mild steel and was threaded (and thick enough) from the factory that way.
I did get out to try it a couple weeks ago (I'm sorry to steal your thunder in this regard)
and results were consistant.
Here we are with a PK-A (red dot) optic
Here is a view of the securing screws--I avoided the whole trigger group problem by going above the trigger assembly altogether--the screws clear the bolt/carrier assembly easily.