It's difficult to set a size limit. It depends on the .sh3d file size of course but also on the complexity of the 3D models used in the home.
If you want to create a larger sh3d file quickly, just copy paste the home of a .sh3d file into another existing one. Using trees and plants should make it larger easily too.

does not seem to have a "View" option under "Furniture".

Sorry, I meant Furniture > Display column > Model size.