I've produced 3 models (in both FS9 and FSX native code): the Air Development and Test Command C1 finished in natural metal and the standard camouflaged C-1s of the JASDF and ADTC. For completeness, I’ve also made the single EC-1 used by Denshisen Shientai at Iruma for Electronic Warfare training:

The models have animated crew and cargo doors as well as flaps, slats, spoilers and thrust reversers. The FS9 aircraft also have steering nose wheels:




This is the EC-1 and must surely rate as the ugliest nose-job ever:

The AI package contains the 13 C-1 aircraft operated by 402 Hikotai at Iruma and the 7 aircraft of 403 Hikotai at Miho. The two C-1 test bed aircraft of the Air Development and Test Command at Gifu and the EC-1 at Iruma, as already mentioned, are also included.
The 3 bases produced by Brent are available in the MAIW Download Hangar. These sceneries are on the list for conversion to FSX code, but I have confirmed that the FS9 versions work well in FSX apart from some small window flickering and tree transparency issues. My C-1 packages include replacement AFCAD files to park the aircraft, a traffic file and call signs, all produced by Brent.
Iruma:

Miho:

Gifu (Air Development and Test Command):

The AI packages have been sent to the MAIW Download Hangar this morning for processing. The file names are:
FS9: JYAI_Kawasaki_C-1_FS9_1.zip
FSX: JYAI_Kawasaki_C-1_FSX_1.zip
Have fun and enjoy.

John