Hi Ben,
One small thing, ive just contacted a old friend who has a paint shop and oven. If i give him my finished boards to sit in his oven for a while, how long? how hot? and what sort of effect will this have on the overall strength , impact resistance and flexibility of the epoxy used?
Post-curing, if done properly, can only ever be a good thing for epoxy resin although, over enough time just at ambient temperature, the resin will naturally reach something very close to a post-cured resin (it will just take a huge amount longer). The exception is where resins will be used at high temperature - they should always be post-cured up to this operating temperature before use.
In terms of post-curing your boards, I would recommend a moderate post-cure as follows:
6hrs at 40'C
4hrs at 50'C
4hrs at 60'C
This steady ramp and not excessively hot post cure will ensure full cure of the resins without putting too much strain on them. The difference you would expect would be a harder feeling resin with more fully develped structural properties (and more of a 'ring' when you hit it, rather than the 'thud' of a resin that's not fully cured).
--Matt