Not to mention you’ll have no warranty, a poor screen when you’ve paid for a better one, hardware conflicts and next to no future resale or trade in value.
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I get the idea, but it is well beyond the technical abilities of the average person. I also don't many people who would pay $800+ for a new phone and then turn around and drop another $100+ to make a new Frankenphone while also voiding the warranty.
I'm certain I have read that LCD runs hotter as the whole panel is illuminated at all times which can/could cause the iPhone to overheat easier. As these phones were not designed for LCD there could be consequences.