I have 2 spare bedrooms; 13x14 and 10x21. The current plan is to turn part of the 10x21 into a craft room. I'm also considering moving my planned 10x17 garage layout into the 13x14 room, so I'm starting on a around-the-wall type design for it. I don't know why I didn't think of it before, but Mike CT's recent post showing his original layout and the expansion gave me the idea of using part of the 10x21 room for a staging yard, thanks Mike. My thought is to cut a dual-track tunnel through the wall between the rooms and build a 3x10 yard in the other room. I'd try to make it functional, even though I'd probably manually configure various trains. I'm also thinking of including a reversing loop.
Anyway, what I'd like to know is does anyone have a hidden yard like this? If so, what are the pitfalls? I'll be using DCS, so I should be able to go between the rooms easily enough to back trains onto their storage tracks. It just seems like there is something I'm not thinking about and I'd like to see if this is worth pursuing before I go too far with my design effort.