Polly Ticks asks:
"How would National Reciprocity where my KY CCDW is valid in every state mesh with Constitutional Carry where I don't need a CCDW in my state? Does that imply I can travel to any other state also without a permit?"
DEFINITELY a problem there.
Vermonters have had the same predicament for years, as (for years) Vermont was the only state in which no state-issued "permit" was necessary to carry weapons.
Sounds great so long as you remain in-state, but Vermonters couldn't carry OUT-of-state -- they had nothing to show [out-of-state] that they were legal to carry in-state.
Now that other states have adopted "Constitutional carry", this could be a problem for gun owners in those states, as well.
Imagine if there were one or more states which didn't require drivers to carry driver's licenses. When stopped out-of-state, how would the officer be able to ascertain that the person driving was qualified to operate a motor vehicle?
Regardless that some may answer "the Second Amendment itself provides the 'license' to carry", that's just not practical from the standpoint of law enforcement.
SOME form of state-issued "license" is going to be necessary, even for states with Constitutional carry.
Otherwise, this isn't going to work.
Aside:
Never mattered much for Vermonters, anyway. New York State doesn't recognize ANY other state's CC license -today-, and I don't believe Massachusetts does, either. The only other direction a Vermonter could drive would be New Hampshire, not sure about there. Perhaps Andy-58 would know.