Just a word of caution, I ordered some Brassmasters etched windows (4mm scale) for one of the Scalescenes factory kits and when they arrived, they seemed very thick and overscale. I asked Brassmasters about it at a show a while later and was told that these were the window frames they supplied for the kit.
I ended up using a different method of glazing.
Thanks CK,
Someone did tell me they'd got some 7 mm scale windows from Brass masters........must have been the variety you ordered.