DIY Board Rack

I just bought a condo close to the beach, and the garage has plenty of space for me to build a proper rack (as opposed to just leaning my boards against the wall
). There is a sturdy wood beam running the length of the wall, probably between 4-5 feet off the ground. I'd like to attach "arms" to this beam to hold the boards upright, and have seen some examples of this done with PVC, but I'm not clear how the PVC is attached to the wood. Has anyone built a rack like this? Or know of a tutorial?
I have searched online, but was only able to find horizontal rack tutorials. I want my boards vertical (see attachment).
Thanks!

I have searched online, but was only able to find horizontal rack tutorials. I want my boards vertical (see attachment).
Thanks!