Re: Nice NUC box
I use Mann Lake for most of my supplies. Their NUC boxes are fine, but they do not have a queen excluder, inner cover or telescoping cover for a NUC :-/
Dadant does offer those accessories for the NUC hive. Only down side is that Dadant's equipment is about a quarter inch narrower than Mann Lake equipment so I don't like to interchange them. Go exclusively with Dadant and you will be fine. I have judged Mann Lake wood quality and fitment to be slightly better than the Dadant kits I've assembled this year.
I try to learn from my mistakes, and from yours when you give me a heads up :)