Not so Geoffrey, there were 2 models one with a shortish bed & one with a longer bed. One I have is the shorter bed model, Think the maximum length for machining is just over 700mm but width is 1270mm
You can actually fit a 5' wide sheet on the bed but would obviously need to support the overhang on the length.
No problem cutting aluminium Geoffrey, cut a few bits on mine already, Gerber produced these for the signmaking market where they would be expected to cut foams, plastics & composites but the machines were hugely over engineered for their intended use.

Yes good luck with what ever you decide Andy.