Updated 2/28/2016:
It's been a long weekend in which I (in order) worked on the western re-alignment, considered abandoning model railroading to pursue stamp collecting, and worked on the eastern bridge approach.
For the Western Re-alignment, I re-did the track alignment in order to get it to fit (this must be the 3rd time

). Below you can see the changes I was about to make (move the roadbed to fit the track).

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By doing that, I was able to fix all the issues you see above. I now think the mainline track will mate up correctly with Switch No. 1. However, it was quite a major PITA and it made me re-think the choice of track for the next layout.
After convincing myself that things were OK on the eastern approach, I decided that I'd better inspect it closely. Wrong! There was a track spacing issue (too wide). Since Switch No. 8 and the Hidden Passing Siding were basically immovable, that left the Eastbound mainline to be re-aligned. Fortunately, that was quick work (see below). Before...

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The position of the tracks, now 4 5/8" center-to-center, was altered by adding 1" to the length of straight above. That pushed the track closer to Westbound mainline. Just to verify everything, I ran the M1a Mountain (my most finicky engine) along the track. Success!!!!
Finally, I measured and placed the 1 3/8" pine bridge cleat under the eastern end of the approach. A 1/4" thick piece of poplar will be attached to it to hold the bridge.

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All this work and I feel like I'm just treading water.
George