I know that Howard worked in conjunction with Arneson on a drive for a 26 foot cat with a HP500 (couldn't find the pic). It ran the same speed as the Bravo, but apparently the owner just wanted it anyway. It looked mean, and I have been told it is undestructable. Not sure on the price, but definatly something that can be done. The drive issue is definately one reason I would stray away from the high HP, and the arneson or the wiesman may be a good alternative.
Roln 20s