Here are comparison pics of the aluminium plate (I found some matching spray), and the unpainted craftfoam plate (I did bevel the edges, but no further detailing):
[ATTACH=full]209310[/ATTACH]
Here you can see heavily the difference in thickness:
[ATTACH=full]209311[/ATTACH]
And a top view with the left side dents in the aluminium:
[ATTACH=full]209312[/ATTACH]
I think even if using 3 mm craftfoam, the thickness would still be noticeable. Maybe aluminium is the way in this case...I will put the Mythosaur on - and then hit it heavily with some steelwool.