Sorted out the mirror mount this afternoon on the drivers door. Ally panel that is bonded and glassed in to the inner edge of the door skin and the metal work that strengthens the top of the door frame. The plinths on the Sierra mirror are cut down with the top plinth bolting through the ally panel and a bracket attached inside the mirror frame for the lower fixing.
Quite pleased with the result.
Cut down the Perspex side windows for the mirror housing and attached these with M4 bolts and rivnuts.
The side windows really stiffen up the upper part of the door skin.
I want to add a rubber strip to the bottom edge of the Perspex and also paint the inner edge black where it sits against the door skin. Oh and the protective covering the windows came with are still stuck on under the little window runner strips so they need to come off.
Next job is to repeat this on the passenger side and then take the windows and mirrors off to bond the skins on to the MR2 doors - but everything is all lined up now so that should be the easy part. Wishful thinking anyway ....