Looking to Replace bottom aluminum case

Hello, I have regretfully dropped my macbook pro a couple times and there seems to be no technical damage because of the awesome tough aluminum case. However it created large dents and warps on the case and I am wondering if I can find this part to replace it. I understand I have to completely swap the insides since it's one big aluminum piece.

It's the part where all the insides of the computer are housed that got warped (in other words not the very bottom cover or the top where the screen is). I appreciate if you could give me a link to where I can find this part and a manual to do it. Thank you