Yeah, kind of looks more like an Archimedes. I think for me the Amiga's keyboard layout is a big factor in its looks. The A1200 is that much different from the A500 but still recognisable on account of the keyboard, and the LEDs. Not sure why he decided to put them in the middle, weird. And the drives are on the wrong side. Never did much like those Mac-style keyboards either, but they seem to be the fashion right now.
I'm pretty sure plastic should be cheaper than metal, but I'll see if I can get a quote. Also bear in mind that requirement #1 is that it's a replacement for original A1200/A500 cases (i.e. fits classic Amiga motherboards), not a new case for a standard PC mobo. Mini ITX/Flex ATX compatibility would be a bonus.