Observatory back side

My slide-off roof observatory in Sweden (60° N). I like to build things so I made it last summer before I took my first astrophoto this spring. It is ca 5 x 2.5 m, half of it with a slide-off roof and the other half an insulated heated control room. The roof is leaning 15 degrees so it slides off easily onto two beams and is moved back with a 12V winch (takes 5 min off and on). When not in use I detach the beams and hang the up on the back of the observatory (you can see th hangers on the picture)