I have a 12x16 room for my Hobby room, I now wish it was bigger!
I used to have a Lee and a RCBS press, mounteded to the dining room table. When/if company arrived, I put a pillow case over them.
Then I got married...
Solid oak stair board $20
Four 1/4" bolts, washers, wing nuts $6
C-clamped to a table in the living room.
Dillon 550 can be mounted and taken down in minutes, and it lives in a plastic storage bin in a corner when not in use
Man hates a voided. No matter how big you build a house, room, shop, it will get filled.
I'm fine with a 2 door lower kitchen cabinet
I would suggest if she is waffleing in whether or not you should do it in the house, she will not be happy with you doing it in the bedroom. I would not want tumbling media in my living space, and the first time you roll your chair over a dropped primer during a midnight quiet brass prep mission she will tear you a new one.