Because it was impossible to make these panels in one piece, the plan was to make one end out of brass and use wire for the other end for the straight edge and hight of the panel and then fill in the middle with body filler.
To make things even more awkward, I only just had enough brass to make the two panels. If the second one went wrong, I would have had to scrap the first one.
They are made from the sprue of a photo-etched sheet of 1/16 Tiger tank parts