Hi Mark -
Looking good!
Are the grades now accurate? If so, you still have awfully steep grades. Going from zero at the front left to 6 inches at the back in a run of about 6 feet (72 inches) results in an 8% grade (6/72 = 0.0833 or 8.33%).
You would usually see a grade like that only on a logging or mining branch -- never on the mainline. Aside from this being unrealistic, in practical terms, you will be lucky to find an engine that can climb such a grade while pulling even one or two cars.
Maybe the drawing does not yet illustrate the actual grades you intend to use. I hope that is the case, because you will be most unhappy with 8% grades!
Good luck, and have fun!
- Jeff