No problem. The RAF, including a Squadron from the Royal Netherlands Naval Air Service, operated the Mitchell II (B-25 C/D) and Mitchell III (B-25J), which carried Dull Red squadron codes, the individual code letter being on the nose, beneath the cockpit, the other two being forward of the roundel on the rear fuselage. I can post the list of codes, and a sample pic if that will help.
However, the Mitchell III (B-25J) didn't start to enter service with RAF units until September 1944, based at Melsbroek, Brussels, Belgium, when the stripes were not normally carried, or, in the few cases they were displayed on these new aircraft, they were on the lower fuselage only.
Might be easier to remove the stripes, and have it as a 'generic' picture, which could be southern ETO out of Italy (although they were mainly natural metal) or PTO.