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I skimmed the thread a bit, but if working on the 6.7 is anything like the 6.4 stay away! Holy dog crap is it a bite. Literally everything is so crammed in there I couldn't even touch the freaking block from up top - let alone get more than two fingers in to replace his Cam sensor!
I looked at a 2nd Gen 6.7 (Post -14) for the newer amenities, but found for about $2.5k and a bunch of weekends I could have the amenities in a truck I can still work on. I have many customers that own the 6.7s, and it is about a 60/40 split with liking them (granted the 40% are first gen 6.7s).
EDIT: Went back and fully read everything, sounds like the 6.7 is a bit easier than the 6.4. When I get the time to do my interior swap, y'all can be sure that a write-up will be coming along with any and all wiring diagrams/changes made.