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I built one for a 1970, I guess they're similar?
I left this job until last because I expected that it'd be really difficult but it went together really easily.
I think I cut my rectangular 1.0mm aluminium sheets to 250mm wide.
Start at the bottom with the forward vertical edge dead square on the seam, cleco top and bottom, then push the bottom edge hard against the sheet below it and clamp to the window frame, one clamp is all that is necessary, not 50 clecos.
It'll be either hard up against the sheet below it or not, if there's any gap at all, push it in harder and clamp.
The sheet can be steered up or down, this will alter the gap between the inner and outer skin and also the point where the sheet meets the window frame. finish one side first, then make sure that your other side meets the window frame at the same point to keep everything symmetrical.
I did my homework and saw most gluing blocks down and making the sheet meet these spacers. Instead, I just measure the gap.
You can pre drill your rivet holes at the front and lower edges of the sheet.
As soon as you clamp the ends of the first sheet you'll see what I mean by "steering the sheet"
I hope that makes some sense, give it a go and good luck.
Stu
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