Well, the Gcat won't make a comeback afterall. One hull is too far gone.

However, this thread is "frankenhobie", so I'm taking measurements right now for my own frankenhobie trimaran. No third rudder though. I've needed to address a few issues, the first being my back problems when sitting on the tramp all day. Second problem is always having too many guests for the Hobie. Third is the flex in the old boat. This will address all these issues. This will provide a sitting ****, room for seven without getting bogged down, and a very rigid boat.

I plan on taking the tramp off, installing bench seats along the frame sides and fiberglass panels for floorboards. The Gcat hull goes down the middle. The existing beams from the Gcat fit across the hobie's hulls, 3 beams will make a very rigid setup. The bottom of the Gcat hull sits a foot lower than the hobie when the beams are attached just as they are. I'll see if that's the right height when I try it out the first time.

I'm not changing any of the rigging or anything on the hobie, just removing the tramp. This contraption will be 8 feet wide and 20 feet long. I'm putting this project on the front burner now with the weather holding up fairly well.