Toshi,
You are truly amazing sir. Your rapid and well-built kits are a delight to follow.
I have the same Monogram B-24 kit in my stash but, because I'm not home (I'm on my way to Death Valley for some sunshine, wildflower photography, and hiking a couple of canyons ) I can't just pop open the box and check to see what part it is - the instructions might not even tell me - but I'm very curious as to what a certain part you've painted light brown/tan is. I'll attach a screen shot of the picture you posted that has the part in question. Not knowing much about the aircraft yet - it'll be a while before I do any research on the Liberator's interior - I'm hoping you can tell me what it is.
Mike