It seems that CR stuff is more US based suppliers but you only really need a tank and seat to get the overall look right. Although various suppliers do some things that are advertised through Classic Racer in the UK.
Thought the K2 had fork legs to accept calipers both sides, making for an easy conversion with just another caliper and new pipes.
As you say you'd be off beam to sling loads of money at it without very good reason, but if it's what you want you'd have to judge the budget for your own means. If you just want a fast ride you're right in that there is so much modern suff that will do it better.
I guess what I'm trying to get at is that trying to make it a brit-style (i.e. Norton/Triumph/BSA) seems out of sorts for a Honda as valid racer history for that engine looks pretty good anyway. And some of those Candy colours zone it right into that era. Perhaps just a little bit of Daytona or California!!
Some of Carpy's stuff looks nice, I'm just not so struck on the more ornate examples and lean more to the function driven stuff as it has a style of it's own. If you geta look at a 4 or 8 leading shoe drum front brake from the sixties you'll get what I mean, it looks sooooo cool but it's not dressed up in any way just pure engineering magnificence (if that's a real word).