Hi Aaden,
You are quite right with your assumption that the iCloud lock is tied to the logic board, so yes, swapping out the motherboard with one that is unlocked will indeed get you a functional phone. The biggest caveat to that is that you will need the home button from that same phone, as it is paired to the motherboard. If you don't take it you'll lose the Touch ID fingerprint detection for good since Apple is the only one who can pair the home button to your logic board.
The Logic Board Replacement guide takes you step by step through the procedure to remove and replace that part.
iPhone 7 Logic Board Replacement - iFixit Repair Guide
If the donor phone where you got the logic board has a working, intact display then the easiest thing would be to simply swap over that screen along with the attached home button. Otherwise you'll have to very carefully remove it from the original screen and transplant it onto the screen of the iCloud locked phone. Luckily for you, there's also a guide for that operation as well!
iPhone 7 Home/Touch ID Sensor Replacement - iFixit Repair Guide
And finally, you've expressed concern about replacing the display adhesive, and iFixit has you covered there as well; there's a guide for that, too!
iPhone Display Adhesive Replacement - iFixit Repair Guide
And of course you can support iFixit's repair efforts by purchasing the precut adhesive that should be about all you need to complete your repair right here on this site.
iPhone 7 Display Assembly Adhesive
That should be everything you need for a successful repair, other than tools if you don't have what you need. Each guide lists the tools used and provides links to sources (usually here on iFixit) where you can buy them.
Good luck, and be sure to come on back and let us know how it all turns out!
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