I help teach down in out Technical school so I built a 5 gal full of 2 inch PVC pipe. I wrap sets of 3 together together with 2 sets of tape, then tape them all together into a big round, then 3 sets of tie wraps, insert into bucket then put in expanding foam. After a few days of drying and expanding I popped it out of the buck and clean of top and bottom with a saw blade. I've had a few suggestions like a rought wood disk or rubber mat at the bottom. Also you can leave the center round and put in a container in the middle for smaller things like chuck used the heavier PVC and would recommend using the lighter one because of weight. I think I used 16 of 12 inch pieces and is heavy without tools. I cut the pipe with my chop saw but be carefull and use clamps for every cut and a fine toothe blade, support the pipe. Have fun and pot pictures. I take some today. Oh yea another thing make sure the foam has dried/cured before putting tools in it. You then can also put another but on top and tie it altogther. I've see another person use the second buck as a stand so it's easier to grab tools from it.
The bike innertubes and Lowe's tubing would work great and last a long time.
