Ugh, I just finished the 1.2.0 guide and had the same issue as darkglobe87. Starting from scratch, I guess, oh well.
Otherwise, here are some things I noticed as I was going through the guide today:
02-Extenders | NVTF - New Vegas Tick Fix
Typo: "... can only be unlocked in windowed mod." — should be "windowed mode"
02-Extenders | New Vegas Heap Replacer
The most recent version of the mod doesn't have cpu_info.exe, or the folder structure implied by the Step instructions.
May need to specify a specific version, or update the guide for the most recent release.
02-Extenders | One Tweak
The mod page link gives a Not found message on Nexus Mods.
A quick Google search gives this link, I'm not sure if it's the same thing: https://www.nexusmods.com/newvegas/mods/59266
04-Foundation | Improved Sound FX v0821
This mod description doesn't contain the step to drag the download into Mod Organizer 2.
I believe this is the first mod in the list to use this installation method — it might be worth ensuring it's included in this mod's instructions.
06-Models & Textures | Alcohol Bottles OVERHAUL - by zzjay
The most recent version of the mod has the 04 - Yup and JSUE Patches patch archived and is subsequently not available to download. The Posts tab seems to indicate the YUP fixes have been merged into the main mod.
Might be worth exploring this further and updating the guide accordingly.
06-Models & Textures | TheFriedTurkey 3 Creature Pack
Typo: codeblock end tag is "</cpde>", causing formatting to go wonky — should be (I presume) "</code>"
12-Gameplay-Economy | New Vegas Economy Improved
The mod page link says the mod has been hidden, with a message and link to use the Economy Overhaul mod.
Might be worth exploring this further and updating the guide accordingly.
16-Interface | Unofficial DarNified UI Update FNV
The ModDB mod page only shows a single file now, with no MCM matches HUD file available for download.
Additionally, the ModDB mod file description mentions that the fonts no longer need to be specified in the INI to function.
May need to revisit this mod to see if the patch is still needed and update the guide accordingly.
Thank you so much for the time and effort to get this all put together! I really appreciate it and the end results