Help with plant shade

I'm devising a plan for a patio shade house for my plants. Its primary purpose is to provide versatile shelving and a place to hang shade cloth, and perhaps frost cloth in the winter, to protect the plants. I'd like to be able to move and reconfigure it if needed and so I'm trying to avoid bolting it to the concrete.I ran out of mini pieces to really complete it but the "front" in the first photo is more or less complete (I think). I also added a frame for a shade cloth awning on the outside for additional coverage. The horizontal bars on either side of the doorways would support shelves, I would likely do 3-4 sets on each. The shelves could be made from 2x4s, standard shelves, plywood, or whatever is on hand. I'd like to not have the pipe along the bottom of the doorways, but I want to make sure the overall structure is sturdy enough. Would the single pipe at the top connecting the two sides be sufficient? I am wondering if it would be sufficient to make triangular "feet" under each of the corners instead, for example (second photo). Is there a better way to do the base than this? The shelves will need to support plants; a lot of water or soil. I am aiming for as sturdy as possible for that reason. I'd love any other structural tips or considerations as well!

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