Mine are all well-sealed oak and technically should be weather-resistant, but they stay inside in the living room. The biggest piece is the ¼-scale Napoleon field cannon and it's not quite three feet overall. There is a faux fireplace that was built when the original fireplace and chimney were removed. It has a good-sized slab of marble for a hearth. Large enough to park the field gun, ¼-scale Coehorn, and golfball mortar.
I don't get to use the mantle, it's covered with Pam's figurines. Angels, faeries, dragons, and unicorns.
The gonnes, linstock, and all bulky accoutrements are stored in another room with the long guns.