Wow, thats a lot of bowling balls!
I'm concerned with the load on that PVC though. What type of PVC is it? Schedule 40, class 160, 200, 315? PVC over time can get brittle if exposed to any type of UV rays. I realize it seems to be in your garage and out of direct sunlight so perhaps it's not an issue. Also, skipping the glue and primer kind of scares me. You have a lot of weight sitting on there and if something gives way, there could be some serious damage done to something or even worse, someone.
It is impressive looking all loaded up though.