Foren / Cotonti / Skins / Blackgrail vs Cononti

Today i finally tried the Cotonti engine.I see why its better then Seditio.
But can someone help me on the Question: How to transfer Seditios Blackgrail skin into Cotonti.
Actualy,i'w been working for a couple of weeks to make my own skin on the basis of Blackgrail, and i dont want to start from the begining.
So can somebody help me on this problem?Thanks