Link for the rig frame I am looking at. And yes, I know it's gonna be a pain in the ass to build. But I'm a glutton for punishment :)

https://www.amazon.com/Supercope-Mining-Aluminum-Crypto-Currency/dp/B073YP99GJ/ref=sr_1_6?s=electronics&ie=UTF8&qid=1528208579&sr=1-6&keywords=6+gpu+mining+rig#customerReviews