First, go to building mode and press Ctrl+Shift+Alt+C then type in rosebud;!;!;!;!etc. then highlight the ;! part and press Ctrl+C then press Ctrl+V and keep pressing Ctrl+V until you hear a noise on the coumputer like a bump and delete 2 letters at the end and press enter even though it says No such cheat until you get infinate money.
then get the cheat bar again and put Move_objects on and build a 2 story house and put nothing in the 1st floor but a teleporter and a burgler alarm. Then delete all the bottom floor but the part with the burgler alarm on it.
Voila! a floating house!(Note:You don't need to put a burgler alarm on the bottom floor if you don't want to) :o)