Good luck with it Ian, nothing is impossible. I just shudder everytime I see a panel Van when side windows "supposedly" filled and done professionally by a panel shop, charged megabucks etc.
I walk around it and plainly see paint/bog shrinks when the holes once were. I end up thinking it would have been better with the glass still in place.

Again, shows up the value of an unmolested sunroof/windowless survivor.