The article could use a little filling out with more detailed steps on how the modular panels were created. There is one photo in the Gallery, but maybe showing pictures of the building process would be helpful to others wanting to try something similar.
I cut 4 of them in half and I use them for the top and bottom sections. You need a corner pvc coupling that has a 90 degree angle and has a third coupling socket for the vertical lengths.
To make the vertical lengths I cut up the remaining 10’ pipe into four 2.5’ lengths.
If you have never cemented pvc you should watch a YouTube video first. It’s not complicated but the pvc cement only gives you about 2 seconds before it solidifies SOLID.