I'm now in the process of trying to straighten/strengthen/soundproof the dashboard.
Rough plan is to test a small area with fibreglass to make sure it doesn't dissolve the expanding-foam-type material its made of. If fibreglass will effect a repair I'm planning to insert wire into gaps between the cracks and then fibreglass over them. Should this be successful I'm then planning to insert more wire or glue on strengthening panels in thin metal, before using heat and clamps to try and bring it back into line to get it flush around the fascia. It may be I can pull the vinyl off and tighten it in areas but I am not confident in doing that without destroying what is underneath.
I'm then going to coat the interior in Dynamat Superlite to reduce vibration and sound travel.
Finally it will be overwrapped with leather which should strengthen it once more and may well be the main thing that brings it back into shape.
The query I have is as follows; looking at the attached picture you can see clearly the top edge of the dash bends down and back up - leaving a depression in the top edge, which rises again. I suspect this is not correct and it should just curve downwards. Can anybody just look at their dash and confirm?
To confirm, what you are looking at here is the top centre above the steering wheel, the front edge in front of the binnacle cover.

