I have a little experience but very little, helping make one of my radio controlled planes that is molded.
The RCGroups.com: The ABCs of Radio Control - Aircraft, Boats, and Cars!
site should have lots of info.
There is shrinkage but it is miniscule.
AIUI Making the 'blank' and mold are the hardest part. A stock would be like a fuselage.
Carbon fiber 'prepreg' is a viable option. Search for it.
I hope that helps move you to the next phase.