“Construction begins with the cockpit” is passe but eventually every build gets there. The Airfix kit has good interior detail, but much of this will be hidden inside the fuselage. Airfix does give the modeler the option of open or closed bomb bays.
The Hasegawa kit has even less detail. The ammo boxes to the rear could be omitted without anyone being the wiser, and would lessen the weight to the rear of the aircraft a little.
I added some quick sidewall detail to the Hasegawa kit, but I didn’t go overboard. I’m firmly not in the “but I’ll know it’s there” camp, my interest in adding detail is directly proportional to the likelihood it can be seen. I did add the interior differences particular to the B-25H, mainly a radio in place of the co-pilot’s station and the Navigator’s seat moved back a bit.
B-25 kits are notorious tail-sitters. When adding weight you want to be as far forward of the main gear legs as practical. Airfix says to add 25 grams under the cockpit. I looked it up, three BBs are a gram, so 75 BBs. I filled under the cockpit, behind the instrument panel, the Navigator’s tunnel, and closed the forward crew access door and added the rest to the Engineer’s station. Only 72 BBs in total but I think it will be enough.
I was going round and round with the interior colors, just when I thought I’d reached a conclusion I found an exception or a contrary opinion. Zinc Chromate is a preservative mixture, not a color, and there was a range of final appearances. After I saw a discussion where it was offered that Zinc Chromate Green was actually Yellow I’d had enough. It may be but I was done. The bomb bay is Alclad Aluminum, The Bronze Green in the cockpit is a mix of Mr. Color 511 and 326, the Zink chromate is a mix of 27 and 511.
I was doing the props, wheels, engines, and bombs as I was going along, and then realized that on the B-25 the bombs would be interior parts and easier to install before the fuselage halves were joined. I finished a mix which included several 250-pounders from the Arma Mustangs, in all enough for a 2,000-pound bomb load each for six aircraft.
Here is the Airfix B-25C which will have a glass nose with the interior completed and washed.
An overhead view showing a few additions. The yellow seat cushions are actually photographs of real cushions, reduced to scale and printed on photographic paper. I used the same trick to make instrument detail on the fuselage sides. Belts are masking tape, and I added armor behind the pilot and co-pilot’s seats.
This is the Hasegawa fuselage before being closed up. Both of the Hasegawa builds will have gun noses so there is a little less concern about getting enough weight, but I was taking no chances. If I end up with a tail-sitter I can close the forward access hatch and add weight there, as one option.
In a controversial move, The B-25G and B-25H did away with the co-pilot and moved the navigator to the starboard seat. He was also to serve as the loader for the 75 mm cannon carried by these variants. The gun was derived from the main gun carried by the Sherman tank, and packed a wallop. It was carried in the tunnel under the cockpit, filled here with BBs.
Part III here: