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-> Custom cases, dual motherboard cases
Custom cases
I found quite a few companies that build custom cases:
Mountain Mods - aluminium custom cases - including double motherboard solutions (seem that some size limitation applies)
Protocase - steel and aluminium custom cases - (some size and configuration limitation applies)
Cal PC - stock steel cases may be customized to your need (some limitation applies)
Two (and more) motherboards cases
Mountain Mods (see Duality series)
Macase (see server cases)
Cal PC (see large server and super server)
Also slightly customised 2-4motherboards cases may be purchesed from Amtrade Products