Jeremy, @jmillan
Your model is coming along very well. The paint work looks very nice. I personally have been very busy with many other "life" events that have been keeping me away from the work bench. I have two other projects that have a priority as they have a December deadline. Once these builds have been completed, I will finish up my 1/32 Hasegawa Ki-44 "Tojo" and the 1/48 Kate. In addition to the pair of Ki-45's I will build along with Spiros, I have been considering building yet another Japanese plane as well, but time will tell if I do this or not.
The device on the spinner is part of what they call a "Hucks" starter. Many aircraft from this era used it. A separate ground vehicle was used to turn the engine over until it started. It was used on aircraft starting in WW1. A long drive shaft was operated by the ground vehicle. As it turned, the shaft would turn the engine over, allowing it to start. If you look close at the way it is shaped, it will "disengage" one the engine has fired up and is running on it's own.
It was widely used by the Japanese on various aircraft as well. Here are a few pictures showing how it was done by the Japanese.