In both windows I see hinges, straight lines were the window could fold on itself in time. If these were foiled windows you could add a bit of restrip in between the glass and solder it in. But with these lead windows how do you reinforce those area's? Little pieces of metal soldered to the back?
For smaller panels, you can use copper restrip or strongline to help out a hinged area, but in Malinda's panel, the addition of zinc came along the sides of her panel should help to take care of that.
Another way is to use some of that strong line inside the lead came along one of the diagonal strips, then bend the copper strip at an angle to match the upper straight edge and continue along the the beveled lead line, still having the strip inside the lead came, and out to the border's edge.
The pic on the left side of the pkg shows how it works with lead.
