A-unit's front window modification

Comparison of the original shape (upper outside edge)

with the shape of the model

reveals that the radius has been too small (ok, the upper part of the frame should incorporate a slight bow, which had been on the loose frame itself but mystically vanished when it was fitted into the shell - now it's too late to correct)

The difference in the edge's radius was corrected - looks more prototypically now

Additionally brass L-sections were applied to shells' ends of the units' shells in order to get sharp, impact-resistant edges.