Guys,
I found some original specs for my 595 sportscab and comparing the two I couldnt see one bit of difference between the 6.1 and mine on paper also a while back was at a ramp with a bloke in 580 trailblazer,apart from the obvious difference's inside the boats and slightly different cabin lengths,parked side by side they looked identical by eye.
Outwoodly it seems most likely the 580,595,610 to be one in the same hull,just badging changes,from the manufacturing side of things it doesnt seem logical to keep changing the physical sizes within similar boats over 4 to 5 year period,would also appear old 560 now 570 and old 640 now 660.
Just my thoughts,be interesting to hear the builders own comments.
Cheers
Wayne