To be specific, there are 162 different meshes in an installation, with options for 6 different variants with different emissive settings depending upon the user's preference (this is where the 972 comes from). This is so that the user can pick the signs with the emissive settings which best tailor to their preferences (low emissive settings for people who like it realistic, higher for people who prefer readability, etc).
There are 27 different locations in Vvardenfell which are pointed to by a sign, for each of these I have created three different textures (and corresponding meshes) - a 'standard' texture, a mucky variant texture (for use in areas like the bitter coast) and an ashy variant texture (for use in areas like Molag Amur). Further, there are two different variations on the mesh appearance, one with a thin border and one with a thicker frame - this brings all permutations for every location up to 162.
Probably, for some locations (Guar Trail?), all of these variations won't even be used, but I made them anyway for completeness.
I just have to replace every sign which exists in the game with the appropriate one of these 162 different meshes. There's 523 of these - for the 'standard' version of each sign, I can quickly just redirect the mesh that they point to, but for the other variants (the different frames/borders and the mucky/ashy variants), I will have to place them manually, so I probably have to change somewhere in the region of 200-350 signs. Not too much work.
Thanks for the offer to help, I appreciate the gesture a great deal, but I'd rather go it alone just so as I know what changes have been made right down to the very last detail.
Edit:
Interesting fact: Bethesda put more effort into their signposts than is immediately apparent. If you have notived the two variants that they included in the game, a thick metal border and no border, you might also notice that they use the thick metal border signs (and the corresponding metal tipped posts) only for signposts
close to towns. Other signposts out in the middle of the wilderness use a more basic, frameless, signpost mesh.
Convenient for me, this is, as I intended to do this myself. I'd always wondered why Bethesda included variants on the signposts, and it's only under closer inspection that I realised that they had a jolly good reason - the exact same reason that I had.