Systems, I am coming up with systems. Next year I can cut a load off the build time. My kids help with certain things, but their schedule for sports, school, scouting, homework really makes it hard to get more than a couple hours a week from them.
When I was making my mountains out of shop towels and fast setting drywall mud, 2/3rds of the way through I came up with a quicker way to do it. I also realized if I would have made most my rock casting (approximate 100+) before starting the mountains, I could have set the rock castings at the same time and I think it would have come out better.
This year I have been able to wire the layout quicker, because I learned from last year. Just an evolution from year to year.