Top Frame for Resin Printer Cover

I bought a simple cover for my resin printer. Everything is great and the cover does its job. But I don't like its wrinkle when I lift it. So I made a frame and screwed it inside the top of the cover. The cover looks better now.
Great deal for the cover
https://www.amazon.com/Printer-Blackout-Internal-Protection-260260400mm/dp/B095CPQHFW/ref=sr_1_1?m=AKNFNYGO5QALB&marketplaceID=ATVPDKIKX0DER&qid=1652344200&s=merchant-items&sr=1-1