To root amaces' LNOS ROM, just flash the addonsu-xx.y-arm-zip file at https://notredame.app.box.com/s/26a4bygh9vbaw7jjq08xr5evomvaw5ww.Thanks for your response. Sorry for my ignorance. These files will be very helpful, but if my nook is at stock now? I thought I needed the full .rar file to root from stock. I suppose I can root CM 12.1 the use amaces files on that. I thought I was taking a short cut. I guess not.
While in SD-card recovery, if you make a full back up of your stock ROM (onto the SD-card) before flashing custom ROM/GApps, then you should be able to boot into SD-card and restore stock ROM from this full backup.
Alternatively, you can go back to stock ROM using the leapinlar's stock ROM & recovery files at https://forum.xda-developers.com/showthread.php?t=2062613. (You should check and make sure that the link to his files are still live).