seems to heavy to me for the size, at least for running well on the ground, I have a large gasser thats to heavy to run on the snow well...your boat interests me cause it has a four stroke on it and I just finished a scratch built air boat with a magnum .30 four stroke...mine sinks maybe a 1/16th of an inch in soft snow, not powder but very soft snow, I don't have room to run it out for long but I believe it would reach 40-50mph if it doesn't blow over. So that kind of performance may be something to shoot for in future hull...however your boat will definitely run better on water and while it may not be a powerhouse it should be super reliable and a ton of fun to just tool around the pond just like my large heavy gasser it...another good test for an air boat is if it will easily run on grass, even up grass hills...how bout some more pictures of the boat...

...p.s. I also fly planes and my plane that weighs 7-8 pounds uses a saito 91, and it just about has unlimited vertical, so thats another way around the weight issue, MORE POWER!!!...