I had a play around with this just now. Some observations:

(1) This is not n00b friendly. If you aren't happy burying your head in code, run away now.
(2) The basic concept here is awesome. This can give a vastly simplified admin interface for handing things which can make for one hell of a messy UI for otherwise. I like it a lot.
(3) Clean code. This makes me happy.
(4) I can't figure out how to make it load the correct template. Either documentation is missing, the plugin is broken, or I'm too dumb to figure it out. I didn't put a lot of effort into working it out since I was just taking it for a spin to see how it works, but it definitely didn't seem intuitive to me how it worked.
(5) The CMB stuff still seems out of place. There are already very good plugins for WordPress which handle this sort of thing. I'm not see any reason to bake that functionality in here.
(6) We need more plugins like this. I see too many custom sites which end up using a metric crap-ton of custom post-types, which results in a horridly complex interface and creates some weird URL setups, whereas a basic page is often all that is necessary. The only reason people often use custom post-types is because they need/want a way to differentiate them within the admin panel UI; this plugin works around this problem quite nicely.