Many of the issues pointed out in this thread is due to the poor quality of the Housing Editing Tools in ESO.
You can move items left - Right, Forward- backward and rotate but the pitch and roll is set at a weird angle. When you try to do a mirrored placement of items you can not accurately do so with the tool.
Seems they have the same tool as I find the layers of objects to be slightly off when they should be the same. The tool also needs a more accurate movement scaling. Correct axis angles to all be true to north, add a few more controls to give us that angular flip.
When you first walk into the large part from the entry hallway you have several pillars that make it hard to utilize the space. Wish I could turn them off or on so I had options to build a bit differently if I wanted. Not asking that they be part of our inventory or house count, just there or not there. Or Skull doorways or Gothic doorways.