Logic Board as Desktop

First off I'm thinking about buying an i7 A1398 mother/logicboard from 2012 or 2015 every question I asked is a bright "yes"

Is there a way to use a macbook pro logicboard as a desktop? How wouls I go about booting the machine on and off? Are there any important parts that aren't on the logic board? Can I just plug hdmi, ac and use the machine as a desktop? And most importantly is it worth the money? Because I have alot of free time in my hands and am not bothered if it's not worth the time.

Author: @emirzyxy