I made frames for the skylights; am going to use grant line casement windows. Other than the Central Valley steel girders, stairs and railings in the tower elevator, they are the only commercial parts. once the glue is fully set, I'll cut out the foam core at the bottom of the skylight wells , and paint the wells white, to help reflect the light from the LED light bar.
Then I'll deck the roof with stripwood, inserting the grant like windows (now skylights) agter they have been painted and glazed. May look at Hobby lobby to see if they have some copper foil I could make a copper roof from. or I may carve foam shingles and paint them gray with a purple tint to look like some really neat slate roofs I have seen.