I looked at the Detail and Scale book Vol 2 on the available P-40 kits and found they say the OTAKI P-40 kit was reissued as Hobbycraft. My kit inventory says the kit is Hobbycraft/IDEA.
So duuuuhhhh..., I donno what I got. It is in a box in my airplane hangar and I'm not running over there tonight to look at it.
I have an IDEA 1/48 Ju87G that is certainly a copy of the Monogram kit, with the 37MM cannon. I also have a IDEA kit that must be a copy of the Monogram 1/48 F4U-4. But in both of these kits it appears that they subjected the kits to be copied to a laser scan but the process seems to have done a very poor job of copying the transparencies. I can easily see how could occur, but it would have been absurdly easy for them to paint the original kits clear parts with some water based paint to make them opaque.