Thanks very much for the kind comments.
I've been working on some of the plastic Warlord Games Malburian figures to see if they would be suitable. Here are a few painted up as the Dutch Infantry Regiment - Van Graben.

Size wise they match Northstar reasonably well but as you can see the detail is not as sharp as on the metal figures, There are also too few floppy hats to create all 24 figures for the right period.
I hope to kit bash some other hats to fill out the ranks and by adding a couple of command stands and a pike stand or two, I hope to create two regiments of foot.I'll show the outcome in my next post once the figures have arrived.
Meanwhile I'm waiting for some cavalry from both Ebor and Warfare Miniatures and i'll post pics of those once they are finished.