Tony,
First off, I really like the looks of your digital camo so far! Feel free to upload it when done if you want to share
As for the part in question, the opposing tabs actually both connect to the flat part of the top fuselage/wing gloves
I recommend building this top part alongside the wings first, then combining to the nose and lastly adding the bottom to it (the part with the double tabs)
The top part, the wing, and the swinging mechanism:
Be sure to cut out the triangles near the root of the wing, then glue the tabs on the mechanism to each other through the hole:
Do this on the other side as well, and glue the mechanism to the inside of the wing glove to fix it in place while allowing the wings to swivel. Then glue the tabs on the top part shut
Now you can attach the nose to the front tab (I advise putting weight in the nose first if you intend to build gears-down). Note that the nose should be fairly rectangular where it connects to the fuselage
Now we can attach the parts with the double tabs. I recommend gluing one of these tabs to the white part of the fuselage underside first, then gluing to the other side, then gluing to the tab on the bottom of the nose
The other piece follows the same procedure, only make sure that the top of the fuselage remains flat; the rear piece should angle upward to meet it
I hope this helps