Being a distributor of PVC fittings, I immediately thought of how I might be able to build one of them with PVC pipe and fittings.
I looked these things up on the web and came up this site: http://laddergolf.com/ I was surprised to learn that a tournament set (2 sets of rungs and 12 bolos) retails for about $120!
I'm happy to say my tournament set cost about $35.00 with some fittings from our site, some PVC from a local home store and some golf balls and nylon string lying around my house.
Step 1: Get a Plan Together
I used one that I found as a template, but I made some variations because I was using different fittings.
For stability and little strength I decided to build mine out of 3/4" PVC.