I never used them in the end, but the images I made are there for anyone who wants them.
Wonderful modifcation! Thank you very much for releasing it.

One big issue though...
The "X is not the same as the one on the left" is only checked when blurring the right hand input. So if you go back and change the first to match the left correctly, it still says that they don't match until you blur/unblur the input on the right again.
It would also be nice for the checks not to run if the field is empty.
I get the same issue with the password meter, it's a little bar a couple of px wide that doesn't change. But it's a custom forum so I don't want to blame anyone in case it's me.
Edit: I see when you pick a username that's already in use it actually names the person the taken email address belongs to. I'm not so happy with that from a privacy perspective, what would be the best way of removing the extra name please?