I was worried about the exact same thing! Don't worry, it won't rebuild it, it just gives you the option to change the outside before going in and everything will be untouched. It won't remove any of you items (so long as you choose the same floor layout, I think?). Not sure about that bit since some layouts can remove rooms or change their shape.
I'm not sure about an edit option but I'm not ingame to check. Hopefully this helps~
Alli, Boots, Hopkins, all time dreamies <3 <3 <3
Buruberu Cycling thread! Check it out in Shops and Services! c: