Britt, the blacking out can be made easy with some velcro and black light proof fabric on frames.
My bathroom/darkroom has a skylight in it, which is very nice, except for when I want to develop film.
My husband made a wooden frame with some light proof black fabric stretched over it. It has the loopy velcro stapled around the edges. The recessed rim around the skylight in the ceiling has the hook side of the velcro on it. So whenever I need it dark, I just stick the frame over the skylight.
I know others use black plastic sheeting, but that stuff just creeps me out, so I opted for the black fabric.
Anxious to see what you come up with!