If your willing to give this such detailed attention, I can give you an easier method but it will not include the head/eyes/ears/hair/whiskers - Just a body texture replace, which may lead you on to doing the rest - I never bothered because I like khajiit heads the way they are and use Tabaxi for a different head, I just wanted to give Khajiit a good body textures for Rob Male and HGEC (but using TGND meshes).
Have a search on nexus for ...
Seamless Hi-Res Khajiit and Tabaxi Textures for HGEC.
A lot of good information and clues as to how things are done there and in the files readme's.
There are five files. One of which the optional file, Khajiit fix, is just an esp which is mergeable in the bashed patch, and pulls all files together properly for Khajiits
You just need to know what texture files to install along with it. I have used Sun1B textures for HGEC Female Khajiit before, but I am currently using the files from DesuChans because that also includes Rob Male textures, and a few extra normal map textures for better detail.
They just need renaming - If using my method, dont use the Pale/Kuro/Shiro versions (they would also need the relevant head etc and mismatch with HGEC head)
To help in renaming them, use OBMM or OBMMex BSA browser, and extract all files from oblivion textures bsa to a temporary folder, then have a look in \characters\khajiit ... When you install files loosely the game skips the same named file in the bsa if you are using archiveinvalidation method or BSA Redirection - The file names you just found out from extracting the bsa are the file names you need to apply to desuchans files

(obviously only for personal use)
Your going to need a folder textures\characters\khajiit\
and in there two folders - male and female
in male I have
footmale.dds
footmale_n.dds
in female
footfemale.dds
footfemale_n.dds
handfemale.dds
handfemale_n.dds
claws.dds
claws_n.dds
tail.dds
tail_n.dds
Those last two tail files, I am not using desuchans, a better tail which matches the desuchan/HGEC body texture better than his own I think is...
Exlorians Khajiit Tail for HGEC (cant link, advlt content - but search for it on nexus)
Hope some of the above helps, I have the above textures folder in a Wrye Bash Bain installer which is the best method for installing a series of textures.....
Spoiler
047 - ==--Body-Race--==
++ 048 - 1.Cobl_172-21104.7z (BFECAEE3) (Installed)
++ 049 - 2.Cobl_Cosmetics_Res_01-21104.7z (C1254BEC) (Installed)
++ 050 - 3.Cosmetic Compilation Revived - Capucine-17042.7z (00C83C68) (Installed)
++ 051 - 4.Exnem-Female-Eyecandy-nvde-v1-10171.7z (58411DC0) (Installed)
++ 052 - 5.HGECBody_v1dot21-BAIN.rar (C530A9C0) (Installed)
-- 053 - 6.Ozmo Hires 2048 for HGEC - Mixed BAIN.7z (86A939F6) (Not Installed)
++ 054 - 7.OFF_1_1_7ZIP-35487.7z (FB9504E5) (Installed)
++ 055 - 8.RobertMale_v5_plus_Average_BAIN-25365.rar (19FA4533) (Installed)
++ 056 - 9.TGND_Release_2.1_BAIN-30914.rar (BD372531) (Installed)
++ 057 - 10.Foxs_Female_Argonian_textures_for_Exnems_body_v11-10506.rar (C068570D) (Installed)
++ 058 - 11.Luchaires_Khajiit_Fix-31156.7z (F067285F) (Installed) <<-------------------------------- Luchaires esp
++ 059 - 12.DesuChan_Kawa_BodyTextures-For-Khajiit_RM-HGEC-Ver_2_0_1-35579.7z (5A65E4CF) (Installed) <<---- Desuchans
++ 060 - 13.Exlorians_Khajiit_Tail_for_HGEC-33745.rar (5E9DD6F1) (Installed) <<-------------------------------- And the tail overwriting the 2 textures from DesuChans
++ 061 - 14.Tabaxi_Version_2-9870.7z (40A7B16F) (Installed)
++ 062 - 15.The_n_Dywyll_Elves-35397.7z (AB7F2FE4) (Installed)
++ 063 - 16.SP_Hair_Pack_Beta_Ver_1_0-30707.7z (4640AFFD) (Installed)
The other way of replacing Khajiits is Slofs Better Beasts (or Slofs Better Bodies which now includes Slofs Better Beasts) - But its Rob Male and Rob Female only, dont even ask if she will be supporting HGEC, likely to get your ears chewed off

Edit: You may hear mention of Ahtata Khabaxi Khajiit - It was an illegal rip of some of Luchaires files out of Tabaxi, and she was not happy. The file occasionally gets re-posted by people who dont know that history ... and promtly banned again.