I thought that I had posted the track plans at one time but I guess that I had not since I could not find them on the blog. So here they are.

The overall size of the N-scale layout is 24' 11" x 15' 4".  Minimum aisle width is 36".  The layout is located in a dedicated outbuilding.

I used Railmodeller (runs on a Mac) to document the design of the two helices as well as the staging level.  I then proceeded to finish the design of the main level and validate the interface between the various levels of the layout. I have attached the three drawings in PDF format.  Interface between the levels are annotated with A, B, and C.  Even though it appears that I will be using pre-made sectional curved track per the drawings, I only used them for the drawings since they were the correct radius to make sure everything fit.

The plan are for the staging level is shown below:

 

The main level is shown below:

The top level is shown below:

The staging level and the two helices are constructed so the main level may get tweaked a bit in the future.