did you only use one layer of mat over the wood?
the reason for it cracking would seem to be the joints you have made with the wood.
if they aren't real secure and extremely sturdy, when you start to flex the dash piece, it will crack on you.
especially if you only did one or two layers of mat.
it also looks like you worked too long with the bondo.
It looks as if it started to kick but you still spread it on. This will cause the pinholes you mentioned, and will make
sanding to get a smooth surface that much more difficult.
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