And here is the all in one picture for everyone.

If anyone is in the Sacramento area and would like to see the dash in person, please just send me a message and I will tell you where to see it, seeing as it's not the dash from my drivable Z and I plan on starting ANOTHER dash very soon.

Seems like you could also fiberglass the underside of the dash. Get a roll of 2" fiberglass tape and glass a bunch of long band-aids in both directions. Can't be seen so no need to sand it, and none of the PITA of applying FG cloth over a shape with compound curves. Maybe that would prevent or minimize future cracks.