You can open the PNG files directly in Photoshop, no need to print them as PDF first.
It wouldn't be me if I didn't do it the hard way!

You can open the PNG files directly in Photoshop, no need to print them as PDF first.
There are 4 "domes" on the back of the model. I can sort of mentally picture how the paper goes together, but seeing the parts prepped and ready for glue I'm having more problems. So to start with I take the lowest part of the dome (the base) and it has placement tabs that touch the back of the shuttle. However, there's another strip that seems like it goes inside this and provides placement tabs for the next part of the curve.
Is this right? Do I put the rings inside each other, so that only the tabs stick out?