I've tested something , i can't move anything but it's a bug i guess :
1. Have a house
2. Place something in the house
3. Select the Change option and Manual Selection
4. Ask an admin to spawn you
5. Boom , now you can see uhm.. idk how to call it here's a screenshot of what i mean
http://prntscr.com/htupcdALSO : When you select "Change" and "Manual selection" it lets you do what i did in the screenshot above with the house floor , walls etc.
I've tested teleporting yourself and leaving the house , so far only being spawned by an admin "worked" , probably there is a way to do it so you can change items but i haven't found it