So,

Here is a design that captures the feel of Southern Pacific's Willamette pass route over the cascades.

 Well, 

here is the current plan for my n scale layout based on the Siskiyou line in N scale cira 1990

the room messures a little over 9'x11' plus a closet (the top, mushroom looking thingy)    Door to the room swings in and is located to the left of  Rice Hill.

you maybe confused at first but let me explain the design.   This is  the lower deck of a double deck layout.

Well,

After many starts, Im working on a tester,, diaorma,  module.. what ever you want to call it, its 12"x36"