There are over 50 turnouts on this layout, plus what appears to be some crossings. I am not up on Nscale costs, but in HO, good turnouts average about $20. So you have about $1000 in turnouts alone...!
I know you said you have drawn this to scale, but I would highly recommend that you try it in a track planning program that will allow the trackwork to be drawn to scale.
If your goals include a realistic (i.e. prototypical) switching layout, you may need to review how the railroad would tackle this. They are well known for keeping costs under control, and any unnecessary trackage would likely not be laid. Same goes for the industrial trackage that may have been laid by the companies themselves. My suggestion is to look again at the plan, and see if you can eliminate some of the connections.
Simplifying the trackage does not mean it will be any less challenging to operate, in fact it could be more so.
I hope that helps. If I can borrow a line from Fred (pgandq) "my thoughts, your choices".
Andrew