1) How do I add a 2nd floor?

2) I want a wrap around porch with a staircase going up to it (the house is elevated) how do I make the staircase so that it starts from the ground going up? Can I replace the low walls with railing?

See snapshot of what I've done so far:
http://i64.photobucket.com/albums/h186/gymnart/snapshot-PradiseHome.jpg

I'm starting to have a lot of fun with this. Thanks for making it!




[Note: this thread was started on sourceforge.net forums]