Original STL files are hosted in thingiverse at
Work out where your cut lines are
By looking where it intersects the main model.
Once you have the model, print it.
spray it some more
Have pull handles and screw locators for the peg board
Then pull in pairs out of PETG so the webbing is on sacrificial areas, having first sprayed some furniture polish for easy release.
But first of course heat it on a quartz heater hot box that you can collapse for storage and transport
remove the molds with a bit of compressed air down the side
Cut out with metal shears, its just safer, easier and more accurate than a band saw. Add magnets and drop in place.
Next step is to paint the visor, but that's another adventure...