Hi Harris,
I’ll have a look at your rig a little later today, but to answer your question about colour conventions.
There is no set colours for specific things, it’s up to the rigger and the project. But it’s logical to colour the same types of things with the same colours.
IK controls the same colour, FK controls the same colour, and tweaks all the same colour.
Colouring 1 side differently to the other is more common in games where the characters need to do a lot of cycles. (that way it makes it easier to distinguish the left and right when you are in side ortho view.
It’s really up to you though. I would say, be logical and consistent (in the same project).