So, I was just checking it out for the first time actually in-game, and I'm really pleased with how it's turned out. I mean, I'm happy with how it's turned out.

So, here are some 'publicity shots', so you can see how it has actually turned out in the end:
http://img.photobucket.com/albums/v680/Wyver_Almasy/Signy%20Signposts/ManySigns.png
http://img.photobucket.com/albums/v680/Wyver_Almasy/Signy%20Signposts/Regional_Standard.jpg
http://img.photobucket.com/albums/v680/Wyver_Almasy/Signy%20Signposts/Regional_Ashy.jpg
http://img.photobucket.com/albums/v680/Wyver_Almasy/Signy%20Signposts/Regional_Mucky.jpg
As far as I can tell, it's finished now. I just need to write the readme and upload.
I'm going to post the .esp here right now though, it looks good to me, but if anyone wants to have a look through and comment on its cleanliness, than I'd appreciate it.

82 Activators Modified/Created
7 Statics Modified/Created
53 Cells Modified
And a whole bunch of references

https://www.yousendit.com/download/Z01Qc0w0eDNRWUpFQlE9PQ