hmm.... I've been running a Cyclone GT Mk I with a 13-30 seven speed cassette (and previously a similar freewheel) for over 20 years.
I think I've used the Mark II version too, but since I don't have pictures, I won't swear to it. I don't think there's any significant difference in the capacity of the Mk I and II, though.
and for context, here's the whole bike...
Steve in Peoria