Ha! Billy I did contemplate aluminum for a long time. But decided to go the cheap and easy route.
How I did it:
1) Remove ugly, cracked dash cover
2) Cut away foam with sawzall so that dash face is basically flat
3) fill holes, valleys and canyons with light weight filler. I used "Rock Hard" because I had some on the shelf. If I did it again, I would use spackle. Rock Hard is difficult to sand.
4) Buy a couple of yards of vinyl from the fabric store. Using bull dog clips, secure the vinyl to the bottom of the dash and gently stretch the vinyl around. Slowly trim away excess fabric.
5) Secure the vinyl to the dash using contact cement and Super 77.
6) Use a scalpel to cut out instrument and switch holes.
I will probably redo it at some point. When I do, I will place a thin foam layer between the dash and the vinyl. They had headliner material at the fabric store that looked like it would work nicely.