Well, inspired by the turntable that Richard Smith made, I decided to make one of my own. I used the EBT Orbisonia pit for design ideas, but made mine a tad smaller in height and width.
Mine is 3 feet in diameter and about 3" high. So, it scales to just about 60’ in length. Now, I’ve made the table itself and got a good start on the pit.
What I want now is to have the sides of the pit be sloped towards the center. The center, about 12" in diameter will be flat with some drain holes. Thus, the slope will start about 6" from the center and run to the edges where the rail is. I just can’t figure out the best way to do this. --I’ve thought about concrete (since that’s what many used), but I’m not sure how I’d pour a slope all the way around. --I could use styrene sheet, but that would be difficult to get smooth joints - and figuring the shape could be problematic as well. --I could use my ballast and build it up to the right shape and fix it in place. So, has anyone done anything similar? Any ideas?