Some early (and really embarrassing) attempts at coming up with a floor plan:

Sketch of the floor plan

Another version of the floor plan

Yet another version

A little incomplete, but there are some stairs at least

Some more detail, but I have no idea what that bottom drawing is...

I wonder what that big "x" through the bottom drawing means :-)

I'm really not too sure what this is a drawing of...
 

Architects, we are not.