At the start of your thread you've shown 5 photo's .... right? Well the 5th photo shows the cut-away roof section. So this is what I've thought .... That piece would have made an excellent vertical section to have sealed-off behind the remaining front seats? It just MAY have been possible to have not cut throught the roof but to have simply bent it at a right-angle. The edges of the roof would need a 45 degree mitre, though. I think that I'll have to look for a spare A2 myself, to give it a go! LOL!
David
David