I think the first obvious question is how big is this. There's obviously a huge difference in scope and possibilities from a shower stall size vs something that's the size of a 12 man tent.
You want it portable, but is this intended more for indoors or outdoor use? Which again can modify the materials options available for construction. You want portable, so some of the suggestions might not work due to the durability of certain materials during transport, set up and take down.
I probably don't have remotely close to the same construction experience than others so I can't help in that regard for suggestions, but I can't help but think that a soft corner (ie: some form of foam enclosed connector) would be easier to figure out than a rigid corner if you're trying to make this portable.
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