I have been trying to put a skylight/velux window and a dormer window into a roof, but am having trouble with getting one to be see through.

If I use a roof from the library I imported, there are two with dormers and you can see through the windows, but when I size the roof to my building, the dormer comes in the wrong place/height on the roof.

If I use a window from the window library I imported and put it into my existing roof as a skylight I can angle it and get it in about the right place and right size, but the glass isn't transparent.

Grateful for any help to point me in the right direction.