I had dreams of that when I moved my office out of the house before our first daughter arrived. But quickly the man cave became an office and instead of metal and mayhem it became work and paying bills
My old man has a man cave I'd appreciate. His shed is big enough for 6 cars but instead of cars he's got it sectioned off, one part for woodwork, one for welding, an office for all his computer gear, a clear area for electronics and a general area for other jobs. He's missing the bed and sofa but he's got a fridge, music, chairs, beer and a wood fired over/heater.