Thanks guys, I've made a few changes and uploaded the skin to the AH Skin Department.
http://www.ah-skins.com/Note I had to save it as a B-26, as there is no listing for the B-25H.
Amongst other things I moved the markings above the fade layer, to give them a bit more contrast. Also added some paint chips on the leading edge of the wing.
The paint patch colour on the nose and cowlings is correct. I've been in contact with Robert Yanacek of
www.vmb-613.com and that was one of the things I asked him. Apparently the coral dust from the airstrip at Kwajalein Atoll played havoc with the paint on these areas so they repainted them in Sea Blue, the same colour as the top of the aircraft. On the skin I created a paint patch layer and placed it above most of the paint fade and dirt wash layers, so it looked less aged. Robert has been a great help and also supplied me this profile, which shows the correct colours.
I don't think the lack of package guns or top turret should be an issue in getting the skin accepted. There were plenty of similarly painted PBJ-1Hs that did have the turret fitted. This aircraft did have the turret and package guns at first, the crew picture on Robert's site shows it.
Robert also gave me this link to a video clip of USAAF B-25Gs doing a cannon attack on Mille Atoll in the Marshall Islands. Mille was a popular target for VMB-613 as well. It is well worth a watch.
http://www.youtube.com/watch?v=sXRuby0OXao