I'm doing this also on my Monaco conversion to the point I've ripped the lot off and got my hands on another Jag and started doing my own kit basically I've gone the root of 'the buck' making it out of anything I can lay my hands on and a shed load of body filler and a lot of elbow grease.
But as a go by I got the book 'The Fibreglass Manual' by Keith Noakes only cost £15 but describes very simply how to make patterns and moulds and my supplies from
www.cfsnet.co.uk
Hope this helps