For 6’ tall I’d definitely do a central pillar in the front front and probably also the back, in addition to leaving a center-front bit of the front panel ala AP cages - the pillars don’t have to be huge, something like a 1x2 or 1x3, I’d be inclined to do edge-on to the front/back - you can get PVC lumber/boards instead of ripping down PVC sheet, and glue/screw it in. I’d also do a center ridge on the roof - another 1x2 on edge front-back on the roof, connected to the pillars.
Thinking about it some more, I’d probably beef up the corners with additional 1x2 pillars (flat-on to the walls) - basically building a frame not just relying on wall strength.
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