Heres a few links that you may find very helpful.
http://www.starshipmodeler.com/basics/jc_molds.htm
http://www.starshipmodeler.com/tech/bd_hol.htm
http://p197.ezboard.com/fatomiccityfrm38.showMessage?topicID=3.topic
http://www.starshipmodeler.com/projects/jw_resin.htm