Hi, Dan, welcome to the forum, and congratulations on this build, it's a great choice, for a great reason!
Yeah, my great uncles were the same way about talking about their service in WWII. Well, they did like to tell the funny stories, like, "Remember that time we got busted and were stuck on KP for the weekend..." Of course, they were all mostly young men, boys, really, and they wanted to get on with their lives, when they got back. But yeah, it's important today to collect the stories as best we can, as they all pass on.
Regarding painting, your cockpit looks pretty good to my eye. I'll second the other post, that it takes practice to work with an airbrush. But I'll add, there's no reason to do just one or the other, unless you have a preference. I do tend to use the airbrush to do areas, like the outer wing or fuselage surface, and a paintbrush for small areas and details.
If I'm going to use a paintbrush to do an area, however, I think of two things: Use a relatively broad brush, and thin the paint well and apply multiple coats. That allows you to apply the color and get a consistent finish, like spraying the paint would do. I've had the most success doing this, using acrylic paints, like Tamiya's, thinned with Tamiya's proprietary acrylic thinner, or with water or isopropyl with other brands' acrylics (Andrea, Vallejo, craft store acrylics). Keeping it thin helps avoid leaving brush marks.
Anyway, I think your interior looks good, I like the chipping and wear, too. I look forward to your next installment!
Best regards,
Brad