er I done a bit, first question is do you have a good panel to copy? second question is how many panels do you want to pull? this will help decide the quality of mould needed, and cost of mould.
next is release agent options, there are 2 obvious options I see for this application, PVA will be cheaper and easier to use but will not last as long and will need more finishing after after its pulled, WAX is normally a multi stage process (sealer, filler, release) this will give a much better surface finish but will take a lot longer to prep the mould and will be much more expensive.
next is construction, heat cured epoxy is not viable so a poly is really your only option, for auto applications you will need a minimum of class 2 fire retardant (if you want to be official) and would suggest you use a low-voc just for your own compfort. if your going to fill and paint, gel coat is optional, personally for this I would not use gel coat, long term this will reduce crazing. For cost reasons I would use matt rather than weave for this, prob looking for about 5-6mm thickness so start with a tissue, then a 200gram followed by 3 layers of 600gram, then some foam inserts for rigidity, 2-3 more 600's and finish with 200 or tissue.
for a panel this size I would normally put half a dozen holes in the mould and fill with putty to use as blow holes, you can then use an air line to force a layer of air into the mould to release.
