Thanks for the advice. Ok, I've gone with the internal colour for the inserts. Here are the latest progress shots of my Airfix P-40B. I've seen some commentary on the panel lines that they are 'like Matchbox trenches'. I disagree. They are a little deep, but they're not wide, and I think look OK under some paint. Many of us accentuate the panel lines on our models anyhow. I will say that the construction does require some filler around the wing to fuselage joint. I used CA and it worked out fine. I've included a photo to show that. The cockpit build up is quite impressive out of the box. I woulsn't rule out my doing a few more of these along the way.
I sprayed it freehand with my Iwata, no masking which I looooooove, exxcept for the canopy of course. I used the Eduard set for that, and I'd have to say many of the pieces were oversized for this kit and had to be trimmed. That's the first time I've encountered this and defeats the purpose of using the set.
You'll notice on the way that the model lost it's guns. As I was building it, the thought occurred that the guns are the one piece of aftermarket that this thing really needs. However, shortly after resolving to live with the kit items, I dropped it and wiped them off one of the wings. I've taken it as a sign and drilled out recesses to access the Quickboost set when it finally arrives.
I've just given it a coat of gloos, although that was after these photos were taken.
Cheers
Tony