I think a point that everyone may not be seeing here is that we have been provided unprecedented access to screen used and derived kit before the long before the movie comes out. There is more we can learn from more visuals and access for sure, but there is enough reference to build the CRL now. Far more than we have on most costumes that have been in the legion for years.
The CRL should be built now for the benefit of all those to come in wave 2,3 and beyond.
Will it evolve? Likely yes, as does every CRL. Will there be finds that make current TFA alpha/beta/omega moo "inferior"? Not likely. They are pretty darn close overall. Average Joe/Jane won't spot the differences. I don't remember any non 501st person at Celebration complaining that TFA troopers' boots or blasters were wrong.
Current TK kits are not perfect. Do some look better than others sure. All those RS Prop kits are way more accurate than my AP but mine still looks good and acceptable. 99.99% of the world wouldn't know the difference. They see Stormtrooper.
And on the topic of CRL evolution...once granted approval on a kit you're in unless it's in such a state of disrepair that it has to be fixed. You can not "force" people to upgrade parts found to be not as accurate after the fact. Encourager them to change, sure, but not force them. Grandfathering happens and will always happen until we completely change the way our club is run. And If it ever becomes a club where absolute accuracy is the focus and the target minimum, I'm out.
Anywho, my two pennies. What was my point? -> CRLs sooner than later.