I'm not sure how to make a poll and there could be many options, so I'll just ask, and you can answer. I got a 2' lenght of 6" PVC to make ledges for my Stitch. What size tubes do you use, lenght and diameter?
Most of my tubes are 10" long, 6" diameter but I do have a couple that are 14" long, 6" diameter. That just provides more room for the pairs and trios to fit into the tube together.