Thanks for the correction on the habaki, Paul. Forgot about that. If that's the case, the shinai is a 2.6 which is long but not stupid long. The shinai tsuka is longer for two reasons, in my opinion: 1. The kote are bulky. I don't think there's enough room on a standard-sized iaito tsuka to hold with kote. 2. To allow extra leverage for all the waza you can do with shinai that you can't with steel.