I'm allergic to beer; whiskey and I don't get along (despite how much Irish is in me, according to my DNA; I hate Vodka (I dub it Jet Fuel); but other than that this game sounds like a whole lotta fun. Where was this idea when I added some platforms to three rooms on the second floor of an existing house I built?
First try:
https://i.imgur.com/ZNJ7PRZ.jpg
A little noodling later:
https://i.imgur.com/8IkETtN.jpg
Child's Room: (He still rooms with his toddler brother.)
https://i.imgur.com/PUWMK0v.jpg
@muzickmage click on the foundation in build mode and then choose which design you want. Click on the base of your house and then raise the vertical arrows that should be on display. Voila you now have a foundation. Hope this helps. :)