I tried to install using TWRP 188.8.131.52. It seemed to mostly work until...
ApplyParsedPerms: removexattr of /system/addon.d/50-cm.sh to 0 failed: Operation not supported on transport endpoint
script aborted: set_metadata_recursive: some changes failed
set_metadata_recursive: some changes failed
E:Error executing updater binary in zip '/sdcard/cm-11-20131202-UNOFFICIAL-fireball.zip'
Error flashing zip '/sdcard/cm-11-20131202-UNOFFICIAL-fireball.zip'
After this, the device just bootloops.
I'm going to try again using the recovery.img referenced in the first post.
EDIT: After flasing the CWM recovery from the first, I was able to install. My phone is booting up....
And success! It booted. I made a phone call. I have 4G/LTE. WOW! I'll test some more tonight and report any issues I discover.
EDIT2: The first boot after installing gapps-kk crashed and rebooted the phone. The second boot hung at the "Android is upgrading..." screen with the message "Optimizing app 1 of 21". During this, I checked the CPU usage and found that /system/bin/mpdecision was using 100% of the CPU. After a few minutes I pulled the battery and restarted the phone. This time, with it unplugged (it was connected via USB to my laptop in all previous tests). It completed booting and finished the Android upgrade.
I was able to setup my Google account and download apps over 4G/LTE.
Google Keyboard, Google Search, and Google + were all out-of-date and got updated.
I briefly tested the GPS using "GPS Test" from CHARTCROSS LIMITED. The GPS worked and I got a lock quickly.
I tested WiFi on both 2.4, and 5 GHz both worked reliably for the brief period I tested.
The only thing I find lacking (and it's lacking in ALL non-stock-based ROMs) is the ability for an app to read the secure element of the SIM. This is a requirement for the ISIS contactless payment system - which I use A LOT. So, even though I'd really love to be on KK, I'll be reverting back soon.