So, a big job - most would consider unnecessary or sacrilegious at the least.
I'll be fitting a rare Polyroof window, found as a pair on Ebay.de. I've always loved the funky dayvan look the germans offered on their conversions and prefer the better viewing, light influx and sci-fi feel they offer.
I know they aren't to everyones taste but this is my 9th T3 and I know what I like and want now. Even the wife isn't sold yet but has conceded any further complaint

Earlier in the year I took the bull by the horns, sold my sliding door (with glass) and fitted a panel van door, which was then cut to suit the matching Polyroof window.





It was touch and go but careful measurement and patience have resulted in a solid, tidy fit just needing cosmetic tidying. Concerns over strength were unfounded as the glass is bonded to the panel around all 4 edges and bolted in at the top.

The door feels more solid now than before it was cut. I will be adding some stiffening ribs to double as mounts for the interior panel and window trim soon.

Now I am looking to do the same on the drivers side.

The glass is virtually the same as the slider panel and I will be using my previous work as a guide to cutting. On the inside it will look similar to this original brochure photo.

I picked up the body cut from a breakers in Leicester but it was oversized and needed a lot of trimming back. Still, better to have plenty of metal.
I've trimmed it back so the join will be along the swage line, possibly using a joggling tool to create a nice flanged edge to tuck behind the lower panel. I am left with this.

I've left the flanged returns around the panel and just need to peel back the pillar and gutter metal where it is spot welded around it to create an 'as original' panel fit. A friend who is a professional welder/fabricator will be fitting the panel.
My thinking is he should cut inside the B and C pillars into the panel and remove the main area of metal then drill out the spot welds like the panel I am working on, but in reverse almost. Then clean up the pillars and gutter, slot the joggled edge behind the lower panel and tap it into place and spot inside all around.
I'd welcome the opinion of others on here about this as I want him to make a nice job of it.