Been following your thread since the beginning & i wouldn't have had the confidence to tackle some of the work that you have.
You are now well on the way to getting it back on the road & hopefully you can bring it to the annual Manta, Ascona Cavalier meet at the VBOA show at Sywell Aerodrome Northants over the weekend of Saturday 6th - Sunday 7th July 2019. I & others would love to meet you & see the finished car.
Before you finish fitting up the front of your car consider painting the area black below the bumper where the indicators are fitted.
The colour i think is called Anthracite & is semi gloss finish.
Your Cavalier would have had that look just like the front of my Manta when new.