Interesting catches re: camouflage design. I had used the official design sheet to make the pattern, but obviously there were some differences with what was actually painted by the yards. I will have to correct those areas when I update Guam. See the official design sheet here:
http://www.shipcamouflage.com/DesignShe ... C_CB-1.jpg The black patch at the stern which you have circled as an error is specified in the design sheet, but I can't find any photos of the stern of the ship to confirm/deny its presence. Your nice high res photo also surprised me, in that the lower half of the portside anchor is painted to match the camouflage pattern - I had never seen this before.
Re: making the masts only 1 pixel thick, sorry but that's not possible given the style constraints. I think if you had spent some time drawing in this scale/style you would understand this and stop suggesting it to artists.
And please, feel free to attempt to spot any errors on the rest of the CB drawings. Good luck!