advice needed on pre preg rifle stock mold fabrication.

DOes anybody have any experience in building composite rifle stocks? I was wanting to build a split mold and use a bladder for use with medium to low temp pre preg carbon. Not sure of what type of mold would properly work as well as proper bladder material? Any advice is appreciated.

Bladder material: vacuum bag will work. There is a video from wyowindworks which very clearly shows the process.

Mould material:
-aluminium (you can easily integrate heating elements)
-carbon / epoxy (with the right epoxy)
-glass / epoxy