Generaly if you want to strategize on potential invasions:
Hotseat vs yourself, declare war, switch sides and do a screenshot.
Note however, that some deployments can vary over time (as ThisEndUp already hinted). Later in the game the dutch do not just have a cannon slot, but already the upgraded cannon deployed! And I totally forgot about the dutch sub. It also shares the german tech and can therefore be a nice addition to their fleet.
About your situation at hand: I would suggest to do some air recon on the german side of the Rhine between Maastricht and Arnhem. You basically want to know whether there's a large enough gap between the northern end of the german line and the potential dutch main positions to exploit in a surprise push. If the Germans are already positioned in a similar way to ThisEndUps screenshot, I would say forget it. You may lengthen the front a bit, but if they stop you dead at the Rhine, I mean just look at the picture: your troops will be in a very bad position in that section of the front. Chances for a successful attack out of that awkward wedge across a major river are slim at best.
Better just send your surplus guys somewhere else (Italy, Balkans, near East ...). Cause enough trouble there and the Germans will have to reroute resources to help their little buddies.
Oh, and additionally:
Units from German minors are literally the best the CP gets! They are stat-wise identical to German troops, but have an extra perk: they can serve not only under their own Generals, but under Generals from every major of their side (Germans, Austrians, Turks).
< Message edited by Bavre -- 7/15/2021 1:48:25 PM >