There was a thread about that case a little while ago, IIRC. The guys who made that case were basically copying Hammer's design at first, but then the Chinese community (I think) complained about it, and made them change up the design a little.
Found the thread by googling "Zig zag alu case geekhack":
http://geekhack.org/index.php?topic=58065.0From GhostOfHarry:
"FYI
This is a 60% case made by a team in china
they didnt tell about the title of their team, but the one opening post is called "Uncle"
they also produces aluminium palm rests too
and their product should be all made of 7075 aluminium
Zeal has talked about its similarity to hammer's case,
and yes they were challenged severely by the community. (originally no zig-zag)
But seems that they have modified their design now"
