It would help if you posted the photo you have. All the 6lb portee photos I have show an almost standard cab with the roof removed. But the Canadian 40mm bofers truck has the cab style you discribe I think. So post your photo and if it is the same as the 40mm bofers truck I do have photos here of it.
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Cheers
Cliff Hutchings
aka MrRoo S.I.R.
"and on the 8th day he made trucks so that man, made on the 7th day, had shelter when woman threw him out for the night"
MrRoo says "TRUCKS ROOLE"