This is a modern redstone house i made. House has 3 floors and working redstone devices. Bottom floor:Auto furnace,redstone bathroom,armor stand changer.
Start by building a foundation for your house. Place 3 oak wood logs on top of each log in the foundation. These pillars will form the basics of the walls.
I've done this on previous worlds, and it doesn't have any real effect on gameplay other than it's easier to build and usually ends up with a nicer looking.