From: Hessen, Germany - now living in France
I notice that there are no engineering vehicles anywhere in Japan's arsenal. Is this correct?
The Japanese did use some engineering vehicles, albeit not as sophisticated as the Allied counterparts, and much less numerous.
According to Frank: "Gudalcanal", the Marines not only captured dozens of hand shovels, handcarts, some generators and air compressors, but also six road rollers, six trucks and field railway equipment including two gasoline-powered locomotives and several hopper cars. This equipment was pressed into service to make Henderson Field operational, since almost no engineering assets had been landed (only one bulldozer, which had to be used for other pressing duties, building a road net I suppose).
I don't know whether the Japanese had any bulldozers. But having no engineering vehicles at all in WitP is not right. Admittedly, even if there were any, it would probably not make much difference, but for the sake of historical accuracy they should be included - and to make JFBs happy...