The latest beta has a revised Ki-61 default skin. Some items like the cockpit, gear and flap bays have had colours changed so anyone like Devil or FTJR who is skinning a Ki-61 and who is also not recreating those parts themselves might want to download it again.
Note though there seems to be a bug with both the beta skin viewer and game at the moment. When you download the default skin files using either it saves the ki61.bmp file in 32 bit format. You will need to drop it to 256 colours for the skin to display correctly in the viewer. If you are using Bright to do this I find you need to load and save it first in your graphics program and then run Bright.