I first saw these in pictures from LMO (LEGO MOC-Off) 2007, an annual gathering of Japanese AFOLs, but there weren't good clear pictures. Recently, though, Azumu has posted pictures of his AH-1S Cobra helicopter, his 90 Shiki tank, and his UH-1J helicopter.
While I'm here, someone at LMO 2007 brought this helicopter (a Havoc? an Agusta A129? Does anyone know?).