Shipbucket

I looked at your sites, and while they, indeed, gave a most valuable general side elevation of the Nabarra, the submitted photos of the real ship should still be studiously scrutinized for the correct shape and form and size of details. You are getting very close to a finished product. There are still a few "ehems" that need to be addressed, such as the (collapsible?) bridge wings, with tarp covering and the fact that, while you, indeed, noticed the missing railing behind the bridge house, you've got two colors now for the same thing; beige and grey, since the railings atop the bridge house also have tarp covering. I compliment you on the shape and appearance of your beige tarp. Now, why not use that as a model to shape the covering atop that bridge as well as the bridge wings? Tarps doesn't need to be beige, though, for some curious reason that is the most common color choice among artists here. If they're grey, they're grey! However, I'd take pains in doing them slightly darker than the superstructure color and also include the "ribs" of the railing behind it. Alas the guns doesn't look quite right. Didn't you notice the Mk XIX? Compare it with your photographic evidence!

under the bridge window you are missing the navigation lantern. it shall have an green color to it. with a black-grey (rgb: 41,41,41) background.

I feel so embarrased.
When I wrote about shading, it was supposed to be "from left to right" so completely opposite - in other words: it should be lighter on the side of the bow, and darker on the side of the stern.
(bangs head into desk)
I am so sorry for that and I beg You for forgiveness - it's just not my day it seems.
(btw. there are some ships around that have been posted and even uploaded to main archive with shading "other way round", so maybe it would be accepted without changing it)

Much improved, I say! Now your drawing agrees with the submitted photos, which means that, since it's a real design, you could submit it to the archive.
To answer your comments on my remarks. Yes, you could be right about it being a wooden enforced bulwark on top of the pilot house. However, I cannot see the wisdom in adding flammable material, especially at such a crucial and potentially vulnerable position. Simple tarp coverings would be logical; but then the Spanish navy at both Santiago and Manila carried a preponderance of such material, effectively turning the hapless Spaniards into giant, floating torches.
The object you're referring to, could've been a temporary covered shelter for the watch. It could also have served as a very crude and primitive fire control station for the vessel's guns. I really cannot tell and be sure. It may have been erected by simple plywood boards, since I can imagine the Republican side, and especially the Basque insurgent navy would've lacked even the most essential resources to outfit men-o'-war!

Two points, the text is anti-aliased, and that should be changed (there are plenty of tutorials online for how to turn it off), and the hatches on the superstructure should be outlined in black - not grey.