Rocketeer Helmet, dimensions: 207.37 x 288.76 x 439.10mm or 8.16 x 11.37 x 17.29in
Scale up or down as needed.
Current size fits my head, hat size 7.5 or 23.75circ
File size 250k poly
I suggest printing the first .5 inch of the helmet and see how well it slides over your head. Then scale up or down for comfort.
I did not model the lenses, I suggest using a welding hood to cut out the pieces you will need.
If you have any questions or nweed help with the file let me know.