[fv1620]

Wayne that's a nice clean diagram. Points you may be aware of, but worth mentioning:

The top 'horizontal' lid slopes down to the outer main wall. Although the slope is more pronounced on the FV1609. So the outer wall has to be made shorter than corresponding shadow it casts on the Pig itself.

The long upper side lid when it folds down reveals not a matching rectangular space but a space that at each end is bordered by rounded upward extensions of the main outer wall.

You'll need to be very careful with the lower sloped panel ensuring it is true in perpetuating the slope of the main armour. Mine slopes outwards a little which annoys me.

BTW you can see in the red oxide picture the places where I have put filler to mask the c/sink rivets. I think the original thin skin was augmented in strength by it being folded over by about 1cm. But with a thicker material I think it is justifiable to side step this detail.

You may well find that the angled support strips welded to the armour have 'Mary Rosed' themselves in that some may be too far gone & some although could be treated & preserved has undulated. It might make the locker engineering cleaner in application & geometry if you grind that off & replace it with new material.