Constructing my own IPhone 6?

So firstly, is creating a phone a good option and if so, is it cheaper? (i don't mind how long it takes to create the phone either).
Also, what parts and tools would i need to make one.

I saw this guy do it on YT from China but i aint going there (Amazon will do)!

It's rarely cheaper to piece together anything from parts you have to buy. There's been three updated iPhones released since the 6 as well. It would be cheaper to buy a used 6.

Even if you could acquire ALL the parts, anything YOU construct IS NOT an iPhone.
That said, you could buy at least 2 iPhone Xs for the cost of parts for 1 iPhone 6.