That “Zinc Chromate” color is a paint on metal surface (to prevent rust). The walls, and apparently floors, on the B-314 are all fabric here, so Zinc Chromate would NOT be the color being replicated here.
As the author noted, he researched the color of the fabric and the fact that these surfaces were covered with fabric and not painted and assured us of that research. At this point, given that this author has been researching this plane for I believe at least 10 years (yes, he’s been working on this model that long, maybe longer, and you can tell by the documentation his research has been extensive), personally I’m going to trust he got the color close to correct.
It’s ugly, yes, but, it’s 1939 - 1941, esthetics were different then
I wouldn’t call it being something “horribly” wrong with the physics, but I also think it’s possible some work needs to be done, not to mention it’s well known and admitted by Asobo their water physics are pretty basic/non-existent, adding its own issues. So I don’t think there’s anything wrong with your installation, and your approach looked spot on compared to the videos, so it seems like your technique looked good. Speed is always an issue on landing, but, as I noted, your technique looked good. It looked more like there’s a contact point issue. And that issue may be that the contact points need to be fudged (i.e. wrong) for it to work “right”.
In other words, it looked like the contact point was right on the tip of the back of the step of the hull, when, really, it would may work way “better” if the “contact point” was well up inside the hull, such that it contacts the water at the point within the hull as if the hull wasn’t there so to speak, if you know what I mean, so it’s where the boat is floating essentially. But I have ZERO idea how Asobo’s water physics work, so it’s going to take some work to get it right.