Keep working on your route. When you feel it's too much, don't give up instead take a break and dive back in again. Creating things takes a lot of effort mentally which can be very draining and even frustrating at times. I've been working on one big route since December 2003. I've rebuilt sections over time as I've improved them, even replaced them completely because my building techniques have gotten better. The route, though still not done in some places, is very drivable and I'll occasionally setup some driving sessions not only to test the route, but also to just enjoy my efforts. I see you've done the same with your session. It helps check things out as you move along.
John