I am in the process of finishing my garage room into a man cave. I used a CAD program on my Android tablet to design the floorplan. I had about 400 sq ft to work with. I wanted to fit a bathroom, as well as have an entertainment area and work bench.
I am almost done, just have to install the bathroom fixtures and the baseboards.
The projector is set up. I have a 12 foot diagonal screen and 7.2 surround sound setup I have learned a lot about residential electrical, flooring, paint, tile, light fixtures, plumbing, and more throughout the process.
UPDATE: Unfortuantely I dont think I will have room for my work bench.