Tigerman, you could have closed off that closet window and replaced it with a periscope, used a really loudly vibrating airbrush compressor and sat on an uncomfortable chair and I bet you would have felt like you were riding in a tank! Really give you a visceral connection to the work you were building!
Yep, full-sized hobby-dedicated man cave is the way to go...glad to hear you turned your son's infrequent visits into something positive.