[CSGAS]

I think you have a solid working plan as well.

The 6-lug rotors are available easily, but I think the 6-lug hubs are usually in a kit with spindle or may only be intended for truck spindles. Does the CPP kit you're looking at say if it's meant for MII spindles? I think they also have different versions for earlier truck spindles, and 1971-72 spindles.

9 times out of 10 some careful selection of inner and outer wheel bearings and seals will allow hub interchange onto the MII spindles. Check the intended diameter of rotors for use with your calipers (the 10.5" mentioned above or one of the optional sizes) and brackets, then make sure the 6-lug rotor you get is the same diameter.

If you have to adapt truck spindle hubs to the MII, offhand I'd recommend buying the hubs for larger bearings (the 1971-72 hubs) as that improves the odds of finding a bearing set to fit the conversion. If anyone's actually done this instead of guessing at odds, I hope they'll speak up.

Tackle one task at a time and the project won't get daunting. Sounds like the steering will be routine (I'm sure you've seen the threads that discuss header interference and the solid solutions employed), and you won't have to worry about odd wheel offsets or other common conversion quirks.