For the top part of the window use a Torus, with an inner radius about 95% of
its outer radius, intersected by a cube, scaled to give you a bow <1.04, 2,
0.04> . Then for the rest of the frame use cubes with the Y and Z scale 0.04 and
X scale as required for length. Don't take my figures as gospel they're just
what I used :-}
Regards
Stephen
