What happens if you replace the logic board in an iphone 4s?

I have a Verizon iphone 4s. The logic board is in perfect condition and so is the SIM card, but it is the outer components that are requiring me to get a new phone. I want to just replace the logic board and SIM card from the new phone with my old ones. Is this possible?
And once I receive the new phone, can I just install my original logic board and SIM card or should I try to activate the phone first?

Yes it is possible, as the logic board have all th information about the iPhone (serial, imei, etc… ).
It should not ask for activate or register.

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