Looks quite a good plan and don't be put off by the second layer as long as you don't make the incline too steep, My new layout is planned to include two layers. It adds more interest. Many layouts are level which makes them less interesting.
As far as four coach trains are concerned I think they are long enough to creat the illusion of length without causing too many problems with run rounds, head shunts etc.
Layout design, I think, is all about creating illusions to try and make things look bigger than they are. Trains disappearing for a bit help this.
Best wishes,
John H-T.
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