The Dutch were renowned merchants and conquerors who colonized several continents during the Exploration Age. Like the Spanish and Portuguese, their focus is on naval and gunpowder units. Here goes.
Gunpowder and Naval civilization
Careening/Dry Dock free.
Trade units generate +1 gold en route, rather than after reaching own market.
Receive +50/100/150 (II/III/IV) gold when a new Market is built.
Gunpowder units regenerate +20HP per minute.
Musketeer (60f, 70g) - Hand Cannoneer with high melee armor and 100% accuracy.
Fluyt - Gunpowder ship available in imperial age. Functions like an Organ gun that fires a volley of projectiles.
Bourse - upgrade from the Market that fires arrows to protect trade carts. Also generates +30 gold per minute.
Markets available in Dark Age.
III: Stock Exchange 400 f 300g) - Receive +10%. (III)/15% (IV)resource interest for every 500 resources gathered.
IV: Armed Merchants (800w, 650g) - Converts Markets into Bourse, which has longer LoS and fires arrows.
The Dutch civ concept is very early modern. I think Hansa civ would be a better option. The Hanseatic League brought together large Baltic cities that were very important in trade. These cities had a significant German population, which constituted the patrician class and was of the greatest importance in this field of trade and not only. I think such a civ could represent the Dutch as well as Frisians, Pomeranians, Hamburg and other North German nations that were famous for their trade and rich cities.
Thus the Dutch would be represented by both Burgundians and Hansa but on different planes - because the territory of the Netherlands was both in Burgundy and the cities of the Netherlands were members of the Hanseatic League.