The first bookcase I made was a stationary one. I should have taken more pics of the process, especially the steps that apply to each section. The sides and shelves are 3/4 inch plywood. there are 2x4 braces on the bottom and 2x2 braces on the top. 1/4 plywood on the backs and tops. 1x6 pine to trim around the cases. 1 inch pipe and floor fittings for the hinge and casters for the door. When you figure out where you want the bookshelves, you need to leave a gap at the top and bottom. The top so the door won't scrape the ceiling, and the bottom for the casters. I routed a 3/4 inch channel 1/4 inch deep into each side for each shelf. Drill holes for 3 inch wood screws so that you don't split the wood and keep your square handy to make your shelves level. if you're sure they are level, nail the 1/4 plywood to the back for strength. I also screwed the stationary cases to the wall and each other.