One more thing:
323,324 Overvalwagen I,II - Overvalwagens (Braat - army model) were made from late 1940. There were no I or II designations, but there were several variations of armament (without Bren and twin Madsens, though):
http://www.overvalwagen.com/overval2.html
There were also more improvised Stadtswacht Overvalwagens, armed with infantry weapons
http://www.overvalwagen.com/overvalw.html
Interesting vehicles were trucks with .50 AAMG
http://www.overvalwagen.com/guntrucks.html
262 37mm AT-Gun - seems, that the KNIL bought some not typical 37mm guns from the USA in early 1942, made by National Forge -
http://www.network54.com/Forum/33033...IL+37mm+AT+Gun
http://www.network54.com/Forum/33033...+Anti-tank+gun
Maybe a standard US M3 gun should be chosen as a pattern.
A forum page on small calibre guns
http://www.network54.com/Forum/33033...s%2C+1919-1942