DIY repair or Apple repair?

I'm inheriting a broken iPhone 6 from one of my family members, and hoping to fix it and upgrade from my iPhone 5. The screen is very broken though, and the body is bent beyond repair. I can easily do the repair myself (I run a small side business fixing phones and computers for friends/family), but is it even worth it? Apple charges 300 bucks to fix it (and I would just get a refurb phone), where if I were to try and get parts it would be around 200. These parts would not be genuine Apple as genuine iPhone 6 parts are VERY hard to track down. Then, I also have to take the time and fix the phone on top of that.

Apple has gotten very competitive.... should I just pay 300, and get basically a BNIB phone based on how damaged it is (smashed corner and bendgate bends, plus demolished screen)? Or should I save 100 bucks, get cheaper parts, and basically completely rebuild the phone myself?