Our house reflects the things that interest one or both of us. So a special piece of equipment displayed under cover (this is California where it's really dusty) is suitable. If I tried to display all the equipment that I treasure we'd have to move out.
I am fortunate in having an understanding spouse-but then we've worked out the rough edges over the past 56 years.
Now-to decide which model to display...maybe a revolving display would work.
We recently completed an 8000+ mile trip coast-to-coast and back on AMTRAK. I'd like to display a model of that monument to discomfort, an AMTRAK sleeping car, but it has to be scale, 1/48. The K-Line cars won't do-they aren't current AMTRAK-and the asking prices are just short of the valuation of the English crown jewels.
Oh, well, maybe Half-O