but floors (only two) are not
Slight correction, IIRC there's 4 (Wood, Stone, Iron, Glass... or 5? unsure, don't remember fully) but yes, walls and floors not matching with alignment is something I hate as well.
You can however (with lots of effort) make it so things look acceptable and/or even good. You can, for example, use Flowers and all as decoration and you'd need to be quite imaginative in how to mix and mash stuff together, so to get something to look good, it does take a considerable amount of effort IMO.
placing ANY object in the "behind" house is actually going to place them in the "foreground" house
Don't forget placing in stairs and falling into oblivion, just to fall back onto the map at some point
Also for some things to look acceptable you'd probably need (or atleast easier that way) to "cheat" a bit. For example, if you do want to utilize walls and needles (spikes) nicely together (walls to delay and spikes to damage or faint them) you can click on spikes (or walls in that regard) hover over an area you can build on, then press escape to pause and place pretty much wherever you want, even under walls!
(Let's also not forget being able to completely block off enemies by placing elevated floors (against a pillar for example) in a way they walk against it - or the inability for them to capture their target by just giving one that's set to Survivor that curse thing from the first "failed" defensive raid where they captured one...)
i try to put glove on me, inventory, storage, ground and workbench....
Gloves are just like a workbench themselves, just without their own inventory.
Simply put: Place them like workbenches, use them like those.
If you do feel the phrasing used in John's memos/guide is confusing, feel free to suggest changes.
(With how helpful he is overall, I doubt he'd take it negatively)