Roger,
I'm a design engineer too (if you check my city, you know at which firm
oooo ...),
probably the 3mm thickness alone gives an huge amount of stiffness.
If you chose a material which allows to bend the edges in the manufacturing
process without producing small cracks it has to be softer.
I guess they went to a highly alloyed aluminium, very hard but allows no
small bending radiuses (sp?). the 3mm thickness together with a higher
E-modul gives the strength
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