Longbow and Eatcrow2: Thank you for your positive comments.
Bluenoser: I can send you an original draught from 1742 of a 150 feet long VOC ship by Charles Bentam, an English shipwright working for the Amsterdam admiralty from 1735-1756. It is too big for the forum (16 Mb), but it looks like this:
As for the square caps: I thinks it must have been at the same time other English features were introduced in Dutch shipbuilding in the second quarter of the 18th century.