Oh my goodness! Thank you a bunch! It looks great! I'm assuming I can open this in blender right?
Yep. I've left it as an OBJ file in case I needed to do any further work to it.
I gave it a look over, it's a little on the large side- should be roughly 5cm in diameter if my measurements are accurate
You can enter the scale manually in Pepakura.
and is inverted but is otherwise perfectly on point!
Inverted how, exactly? I followed references from appearances of the glyph throughout the Halo series, it's pretty much spot-on.
What did you make it in?
Blender. I'll probably need to go back in and extrude some edges so it's a little thicker - it's only 2mm thick at the moment, at current scale, so giving it a little more thickness (another 5-8mm) should make it pretty much good to do. I designed it mostly with 3D printing in mind, however.
EDIT: I've thickened the file out to 6mm (at your suggested scale of 50mm diameter), if you like I'll package the file up and send it your way.
EDIT THE SECOND: I've checked my model against larger-resolution screenshots I've found, and the model certainly seems on-point.