Just my humble opinion, but I would use a waterproof pva glue and clamps for the splits as it has less build than an epoxy so a more invisible join. Then, when that was all dry I would epoxy the holes. When I see splits like that it's usually because the hole wasn't drilled big enough and so the screw strains the grain from the moment of insertion.
Would you have enough leeway to glue some veneer on the back where the holes and split break through. Even a very thin skin can provide alot of strength.
Then drill the exact size of the core of the screw.
Apologies if I'm stating the obvious, if you know about wood repair.
Nick
Thanks, Nick, PVA is excellent, and what I always use for jointed surfaces, but I prefer epoxy for this type of repair. The repair won't be visible anyway, but I will fill the holes with epoxy thickened with some mahogany sawdust. The pilot holes were definitely not drilled large enough, if there were any drilled in the first place! I will be moving the mounts for the windscreens forward a bit so the fasteners will not impact the dash board at all, which is as it should have been done originally.
And, yes, I do know a bit about wood as I helped build this...
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