Good questions friend,
Just depends on what options of ROMs you'll want to run in some later months.
Basically to as in where your Android OS is at - Nougat or Marshmallow - on your device.
Then if your presently running a custom ROM right now.
If you want to go back or a first time to ADB flash the Stock Nougat OS then your links and the guild is best, observing the two commands listed in the instruction to use if you don't want to relock the bootloader.
You can even go there to adb stock flash nougat and then to twrp flash a custom rom (offered for clark nougat) - of course adb flashing the/a unoffical / Official version of TWRP first for a custom recovery to replace the stock recovery in nougat.
A Nougat OS (Kernel and Modem) Clark device with the recovery being used as the
latest Stock Official TWRP - only can
use NuclearROM 20180325-0739.zip (links to all NR builds in post #435),
or the Unofficial LOS 14.1 clark builds from (say March 2018) onward in builds.
I haven't followed other Clark custom roms based on unofficial LOS 14.1 (Nougat) to know "
if" and/or when their maintainers may have updated to use the Official TWRP version or not, as in the file/partition change that HashBang revised in the unofficial LOS 14.1 clark builds sometime in the first couple weeks of Feb. 2018.
This is an
Important Decision as which one of the TWRP versions (Official versus unOfficial) you'll want to use and the custom clark roms available to use of each in the versions of twrp, but, adb flashing to the other twrp version (unOfficial HashBang TWRP or latest Official TWPR) for clarks is easy - just remember you may not be able to use your prior twrp backups easily in their restoring without understanding how.
Still again with a Nougat OS (Kernel and Modem) Clark device and with the usage of the
Custom Unofficial TWRP version by HashBang installed you can use
NucleaROM 20180111-1251.zip (that OP links to) and in
any Unofficial LOS 14.1 older clark builds (say from) very early Feb. 2018 and backwards dates.
As well as these Custom Roms working on Nougat Modem with the Custom Unofficial TWRP version by HashBang.
Search my name in this thread for other helpful install or informational related posts or just ask your questions about how to flash NR if you have any - root (two methods), and g-apps are all optional / the wakeblock app or it's folder is mandatory to do something with in disabling or removing it...
Thanks
enjoy