My mancave is about 1/3 of a structure that is detached from the main house, on our property. The man cave space is about 17' x 11', partially finished, and is about maxxed out in its current layout. I've got 4 cabs, my desk/work-from-home area, and a heavily populated console corner. I pull out a 6' fold-up table whenever I need to do testing, repairs, etc. I've got space for at least one more cabinet, if I move the two boxes of vinyl records that are currently on the floor where a cabinet could go. I could remove a table and some chairs in one corner, and potentially make that 2-3 additional cabs...but frankly, the small table and chairs adds to the ambiance, and provides someplace to sit and drink beer when it's more than just me playing.
I worked up the current layout in autocad when I determined to create the console corner, and the space is being used about as efficiently as possible.