Oblivion Character Overhaul has just been released:

http://oblivion.nexusmods.com/mods/43612/

Possibly the mod that this game has been waiting for since 2006 with regards to character visuals.

Completely incompatible with any mod that edits races in any way, including hair mods. I'm using the Coolsims hair pack, which prevents me from using this frankly phenomenal mod.

My question is - how do I add the Coolsims hairstyles to the races in OCO?

Any help will be greatly appreciated.