metal building workshop/mancave

[Keywest18]

Me and the wife got approved for a house loan. So fixen to start looking for a place. I noticed that metal buildings are fairly cheap. Without the concrete slab.just wondering if you guys have any metal buildings and what size. Whats it used for? Im thinking a 20x40.i just wanna be able to fit one car in it. Im thinking of walling it half way so I'll have a 20x 20 garage/workshop and a 20x20 mancave. Are they pretty easy to insulate? Doesnt have to be very efficient just wanna keep noise down. If you have one can you post a picture. Also thinking of having a 12' leanto. It will be.nice to clean fish in the shade....