Great tutorial! I made and used modeling chocolate in my latest cakes and I found this troubleshooting guide on the internet very helpful in case it is oily or crumbly. Both problems I encountered with different batches.
http://www.hungryhappenings.com/p/melting-chocolate-and-modeling.html
Benni - http://www.facebook.com/pages/Adventures-in-Caking/128896783863694
