Actually, the 4GB boot image is old. I think it is leapinlar that posted a way to just stick the files on the sdcard at just a few MB literally. Its entirely possible to backup stock to a 2GB. Running cm on it though, well I don't remember. You'll have to search for it though as its not as straightforward as it sounds.
HTC sensation 4G | Revelation ROM (Calls don't go to missed upon answering thank you very much.)
Nook HD+ 32 | Emmc cm10.2 ROM, Ubuntu touch 14.04 (Rock solid - up time 120 hours? Check!) (MBG4GA, 0x000015)
Replaced by above: Nook HD+ 16 | (Testing finished - random reboot results: defective tablet) (MAG2GA, 0x000015)