The primary hurdle to jump with belt driven turntables is their inherent belt creep.
It is best described here...
http://db.audioasylum.com/cgi/m.mpl?forum=vinyl&n=694178&highlight=belt+creep&r=
It is best described here...
http://db.audioasylum.com/cgi/m.mpl?forum=vinyl&n=694178&highlight=belt+creep&r=