side tables

I have perused the forums and used search function and am not coming up with much information on how people are attaching tables to the sides of a CT......
Any suggestions?? I've seen Bob's Pvc-in-a-PVC but couldn't find the ones used C-channel (IIRC)......
Any suggestions?? I've seen Bob's Pvc-in-a-PVC but couldn't find the ones used C-channel (IIRC)......