I've just found out that this "D7" is in fact a "D8". Just check out these pics and compare them to the kit parts. I'm sure the scratchbuilt D8 dozer was used as the kit master. It was also used for their other "D7" kit as well (OOP)
http://als.miniature.perso.neuf.fr/bulldozer.html
http://photostp.free.fr/phpbb/viewtopic.php?f=46&t=6694
H.P.