For real now, do you have any free time left after doing this?
Like... the games building controls are absolutely horrible and painfully slow and awkward to use, and thats already ignoring the fact that most things dont fit together properly.
I got used to it fast... It's just as crappy a set of controls as Blender! LOL! Also, the wall partitions are the best way to go, then just use the premade room frames with the floor and ceiling. If you use the "walls," framed floors, and ceilings, that is when you end up with wonky results. The partitions fit just right, except windows, which you stagger two partitions in one space, then the window out one. Inside it looks right and outside it's not particularly noticeable. Also, another trick I use is I will decide how many rooms I want. Spawn 1 room frame, then duplicate it, stacking as needed until I got my home framed. Then I spawn all the items I want in my living space, and make a living room folder, plop it all inside, next is kitchen, then kitchen folder, put all those inside, then say bathroom, same, then bedrooms, and usually a kinky sex playground room, same. Now highlight all folders and drag to living room, then deselect living room folder, and drag the remainder to kitchen, then bathroom, etc. Then I place all my furnishings roughly where I want them in each room, then put up the walls, then tweak things a little better for the overall fit.
It speeds up the process a lot.