I live in an apartment with a very understanding wife, two kids, a mother-in-law and three fishtanks. Needless to say, modeling is a challenge. All of my model work is done out of a cherry chest that doubles as my workstation. I've built a variety of accessories for it that nest into it including a worktop with slideout drawer, a test stand/cradle and nested boxes for paints and such.
I've also built stackable storage for my club run night bound trains. Each box holds up to 10 full length passenger cars and 5 freight cars or up to 30 freight cars alone. All 6 ride in a wheeled cradle that rolls under my N scale layout when not in use.