Hi, I might be able to help a little.
Billing Boats have over the years showed different details and versions of their boats, and even the meassures is mentioned a little different, so an excact meassuring in centimeters might help.
Of the larger trawlers Billings have also used different names for the same boats, but basicly they only made two.
Progress, Flevo and Trawler was the names used for more or less the same boat, and this should be 81cm long and 20 or 21 cm wide (I have catalogues giving both widths).
I have a very old picture of the Trawler, that looks different from the Progress, but still have the same name visible on the name plate on the super structure, so they changed the look too.
Nordkap is the other larger one, and is in an old catalogue stated to be 81.5 long and 19.5 (sometimes only 19) cm wide, - meaning slimmer than the others.
Regards
Steffen