Regarding the AR10 platform keep in mind that there are 2 proprietary platforms - Armalite and DPMS, which are NOT compatible with each other.
Do some research on the 2 then decide which one you want to go with. Outside of that it's pretty similar to the AR15 platform. Start with a lower receiver (forged, billet) and begin the build.
Good luck, keep us updated and include pics
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"either way, you were guilty by association, so you were smited...." JD