I had made an attempt at taking it apart at the beginning but all that happened was one of the fixing lugs broke off.
Yes, most of these alterations would be nice but at the risk of me knackering the body I'll probably just do a few mods instead.
If I file the window frames flat and file the top section up towards the roof, making it slightly thinner, I could then possibly plant a pre-cut/shaped piece
on the cab side. Thus blocking out the extra window and this will have the curves needed. Glazed windows, maybe.
All this is meant to be, for me anyway, is a learning, practice and confidence building project. I do appreciate the help, advise and suggestions given, I'd never have thought of giving this a go without the support this site and members offer.