• Main line is DCC and while most curves are greater there are a few tighter curves at 13" (mostly hidden). 
• There is a single isolated DC line.  IT is the inner line of the double mainline.  I have too many old DC engines to convert.  
• In town there is a trolley/tram line.  Still N scale but with 6" min R curves. 
• In the corner, on a hinged access hatch is a Z scale circle.  This will be part of "Santa's Village" an amusement park I remember as a child.  The Z scale will be the Park's small sized train.  Could end up being Nn3 if and when i ever get an Nn3 steamer.  In the meantime Z.  
• Track Elevation "O" is to be about 50" off the floor.  The max is E4 (curved trestle in bottom corner) and the scenery under the trestle goes down to E -4 below the benchwork so the trestle will be 8" about the river.  

The Shadowbox is being built and I did find that the print function of Xtrak is great. 

Very open to design changes.