you cant move the menu, but you can move the building area by first pressing shift and then left klick (dont let go) and move the mouse around..
maybe its not shift, im not at home right now so i cant rememanber exactly.,should be alt or shift...
if you want to change flor you can either do that by pressing F1 for floor 1 F2 for floor 2 F3 for floor 3, etc..
or by doing it manually.. at the top of the house building window is 2 menus ( forget what they are labeled) the one to the right you need to klick, and then check the options in there, you cant miss the part were to change floor... you can also delte the fountations so you dont have the grass platform and the stairs.. your house owuld be right on the ground...
P.S: Ghosthunter, incase there is no way to doing so then use the house building program only for doingfences, like stables.... or pyramid like designs...youd have to make your towns manually,
take a fish steak,
then take the ID of an item you want to copy (so go to a stone wall... [props it, remeber the item ID of it, then [props your fishsteak change the item ID of that to the one the wall had and itll turn into a wall, I dont know if you knew stuff like this, but i wish somone would have told me a lot sooner then I foudn it out... so it doesnt hurt to say, maybe lots of people dont know this kidna stuff