FWIW, I got a good, "tiled" look for deck plating on my 240-scale LST entirely by spraypainting, under alternating tape strips. Of course, adjacent plates then had different heights - one up, one down, and so on - but it made absolutely no difference to the final effect, and appearance. My only difficulty was that I had to really lay the paint on thick, to get a noticeable effect - but at your smaller scale of 1:350, a single, good, heavy spray (especially with Testors rattlecans) should do the trick.
I don't know exactly what "Zimmerit" is (though I think I have a pretty good idea), but I'm sure you'll do that justice, too, buddy!
Don't see anything "substandard" from here - except maybe some of the missing kit details, which you're inexorably correcting...