You can push the oven out of the house. I like to put it on a stone floor tile, arranged so the body is outside the home and just the interface / doors are inside. Solves both smoke and space problems.
The ferment barrel is a good candidate for loft like your spinning wheel. It will drop the product onto you, and is accessible by looking up, but its bulky and in the way.

you can bury all the forge and workbench upgrades. But the question is, does that count? If you have a hidden, inaccessible area, its still a level, right? I mean the chests as floors is pushing it, but when you bury the adaze & chopping block etc....

you can also push the hearth outside and avoid a chimney/smoke solution. But you have to get a roof tile over it somehow if you want it to work in the rain.

19 comfort without seasonal stuff, I think is about the max. That means you need one of the bulky blackwood tables, and a hot tub, if you want to max out. I would also say that 1 portal to a hub is almost a requirement, but it could be outside I guess. They don't take up much space against a wall.

just about anything except the bed or tall stuff like throne can be layered with shelves over it.