Well, no root yet. But if you go the
XDA Nook Glowlight thread there are instructions for sideloading apps to NGP.
Hacker Tools was also valuable.
It took some effort involving installing Java, Android's Studio Bundle (A 1.1GB download) and re-familiarizing my self with a command prompt (how retro!) I now have Nova launcher, calibre companion, Stockfish Chess and Moon Reader pro running on my Nook.
Using Nova Launcher as the default launcher makes the NGP look like an android tablet from another manufacturer with nary a Nook reference to be found.
Full screen is sort of broken inside apps with the exception of Moon Reader; its option for full screen fixes the issue. There are full screen apps out there but they require root. Nova crashes when I try to change the wallpaper as well.
I haven't tried to install the Play store yet but as I have made the changes I want to my NGP I see no real need to. Perhaps I'll try to install the Play store when root is available. I'm also interested to see how battery life is affected.