I design and construct outbuildings, sheds and garages for a living, and often think that I'd love to be able to afford what I construct. Example below. Sadly I never get to lay them out inside though.
The shed/workshop that I built at our last house was this one, which I spent many happy hours in. It was just as a man cave should be, and was a bit of a meeting place for evening socialising with mates.
But since we moved some four years or so ago, other than the shed below that I made to house the usual gardening gear, I have been without a shed. The only cost involved in making the shed below was for the ballast and cement to cast the base. The rest was just salvaged rubbish.
Just this week I decided that the time has come for me to make a proper man cave, so I have decided to convert half of the garage into a shed/workshop. I have only just started the project, but you can get the idea. With any luck it should be neat and tidy inside with everything just in it's place.