Not everything was Measure 11. This website will give you chapter and verse on the Measures in use.
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There is no "right" way to render the 5S and 20B paints used. If you're determined to get it as right as possible you'll need paint chips depicting the colors as formulated by the navy.
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Trying to figure out what the colors were supposed to look like from website images will point you in a half dozen directions.
With the paint chip you can order paints on line, go to a higher end brick and mortar hobby store or an arts and crafts store. You could go to Walmart and find an entirely suitable color, but their supplies have garbage quality control. If you were to go back in 8 months to buy more you'd find the color discontinued. That's why their paints have such fruit loop color names, "Arctic Sunset Blue." They can't maintain color matches, so they need new paint names. This isn't always a downside, esp. If painting ACW Confederates.
Prime the model. I use Testors Aceylic Gray. Apply full strength paint as the Measure directs. Then dry brush SPARINGLY with a lighter blue or medium gray.
Feel free to vary your paint supplier from ship to ship. There were always subtle variations based on where the ship was painted, and fading and weathering shaded things.
Don't be afraid to extemporize. Medium brown on some of the motor launch covers is OK. If the model depicts Carley Floats, brown here is also OK.
Also, consider mixing in some models from Viking Forge. They're metal, blend reasonably with Panzerschiffes, and are in many cases comparably priced. Be mindful of "SB" coded models. These are SeaBattle models that are a full order of magnitude more detailed than Panzerschiffe's models which will not fare well by comparison.
scratchbuilds another Victorian flying machine.
