John
did you just add the weight of the hippo to the seat weights for the pilot and pax. that would work for the fore and aft CoG, but would be wildly inaccurate for lateral CoG.
Pretty sure those skids stick way out past the body of the 44, and the seat lateral CoG positions are in the center of the seat. If someone with a 44 could measure how far the skids stick out then you could do an accurate lateral CoG and probably find that it is way out of CoG...