Get the wire mesh at your DIY store. Good for ship railings and with the right size you can make some chairs from them too.
You don't have more info or pics of the tools you use?
As requested. These are pretty much the tools I've used on this build so far and the ones I use most often. The black X-Acto has the freshest sharpest blade which I transfer to the other X-Actos when they get a bit dull but are still useful. I also have another steel ruler which is quite useful to have.
More tools I have or use fairly often. A few tools not shown: wood pencil (a bit blunt for scoring cardboard) toothpicks as applicators, and needle nose pliers and jewelers saw. I do have others about but that was what was on my desk and in reach.
Here you can see the steps of making those oval windows. You turn the punch upside down and then you can see the alignment lines on the cardboard and can place exactly where you want the hole to go.
Cladding for the wings. Using the blunt pencil to score the back of the cardboard to help get a straight line and I use the ruler also when bending it back.
The wings with the left side complete and the right still uncladded. Cutting a millimeter off the trapezoid on two sides allows the flaps to be separated a bit from the main wing - no need to etch panel lines. The cladding cleans up the wing, makes a rounded front and the creates the typical wing shape. It also strengthens the wing.