Interesting indeed, the hull shape looks g-cat, but lots of details don't, could have been modified over the years. It has deck mounted jib traveler and that doesn't look like a front tramp setup, bow beam is too small and set below the deck. Also the main tramp isn't connected like G-Cats and it appears to be vynal. Rear beam doesn't look right either. Compare to this G-Cat 5.0 below.
Could be an early/late model or a frankenboat assembled from G-Cat hulls.
Mine doesn't look anything like that,
Beams are different and is missing the hull ports
Rudders are different and There is a jump up in front of the beam,
The G-cat doesn't have that.
I believe that is a G-Cat 5.0 first year of production. They orignal G-Cat 5.0 had a step deck like that. Later they were changed to a level deck. The same style as Han,s sailed to Mexico on as a publicity stunt for the G-Cat. But as my wife has told me before, I could be wrong.