I think the reach version looks a bit hard to do.
My next project is a standart recon helmet which i have just started peping.
But i am also still working on my first helmet wich is a standart rookie odst.
I´m just running into a bit of a problem finding som toned plexiglass or polycarbon for the visir.
I started it with a pep file.
Then gave it strength by putting fiberglass on the inside.
Lastly i used polyester putty on the intire outside and keept filling and sanding
Till it looked the way i wanted it to.