Step 1: The build
Sheet of 3/4" smooth plywood
Sheet of 1/2 plywood
Long bolt and washers for top pivot point
Misc. trim /spacer wood
Rubber wheel 6"
Trim to match house
Gate latch with fishing string and special book for secret opener.
I begin by making a door frame to the exact measurements of my brothers closet. The dimensions of the finished door came out to be 34" wide, 77" tall and 8" deep. I assume if you are building this project you have enough wood working skills to make a bookshelf and your sizing will vary so I won't go into detail about that.
The door is a solid bookcase made from 3/4 smooth plywood and 1/2" regular plywood for the back. Glued and screwed on all sides. There are five attached shelves and adjustable shelf holes drilled at the top. I made a template to help drill the holes all the correct width and height.
One of the hardest parts was the hinge point. I used a lazy suzan on some 2x4 blocks for the bottom and a long bolt for the top. It took a lot of measuring and testing to get it centered right. Adequate spacing was needed on the hinge side to just barely clear the door frame and still be covered by trim.
Most commercial doors have steel frames and don't need caster wheels. Due to the weight of the shelves and contents we added a bed caster. Which needs to be changed because it's marking my brothers soft wood floors.
**Update. New 6 inch rubber wheel replacing bed caster, installed a little bit higher and hidden with fake books. It does not even hit the floor so I think this fixes the problem.