TLDR: Broken Chassis on HP Pavillion 15.6 Gaming Laptop, Originally Plastic Case, Wanting to Know if I Can Replace with Metal Case

Hello, I have an HP Pavilion 15.6 ec Gaming Laptop. There is an issue with the back case and front case, specifically the plastic near the hinges cracking and deteriorating. I took it to a laptop shop and they confirmed this issue, they are charging me more than what they repair should be. I am planning to do the repair at home on my own, but I would like to know if the replacement could be done with metal cases, and if so, where would I be able to make such a purchase. For now if there are no options for this, I will go with a plastic one The cracks in question:

Laptop specifications: