I have a helmet shell from Steve Stull. I got it off Ebay a number of years before I bought my full deluxe working helmet from him that he never delivered. Before that I talked with him a lot about getting parts so I could build my shell. He confirmed it was his, I think from his Hero season 2 helmet.
Anyway since he totally screwed me over, took my money, and never delivered my helmet, I have no problem letting someone cast this shell if they wanted to do a run.
Steve cut his acrylic visors, but one problem was they were not curved enough. Studying the show I noticed one of the little pull up and down tabs on the bottom of the visor. This is not only something the show would not be able to make, the shape, curve, and general size of the Timerider helmet match perfectly.
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The Airwolf visors never had a pull-down tab.
They also changed from early Season 1 to late season onwards to Season 2+. They are not as curved in Season 2+ and the bottom edge has been contoured (as on Steve's). In early Season 1, they have a straight bottom edge and they are so curved they're almost bubble visors.
The helmets were changed mid-season 1 (new smaller/slimmer moulds, visor and padding) and then again for Season 2 (new moulds with wider mohawk and raised side panel for the switches). The mohawk wasnt straight on the Season 1 helmets, it starts off centred at the back but then skews to the right where it meets the targeting array. Early season 1 helmets have a single round button which was glued on and did nothing (and sometimes fell off - in the "Raise your visor" shot in the Pilot, Hawke lifts his hand and presses a button that clearly isn't there!), then a single rectangular button in late season 1 and then three switches for Season 2+.
One thing that struck me about Steve's helmet when I got mine (I got an unfinished one on eBay) was that the visor movement is more of a pivot than a smooth curving motion. (I removed Steve's visor.) The visors in Season 1 at least have a curving movement that matches the curve of the visor, if that makes any sense. It's like they're on a track. They aren't, but they are not fixed directly by the visor itself. There's a piece of white plastic fixed either side of the inside of the visor, with a protusion that is attached to the top edge of the visor. The servo and arm are connected to one of those bits of plastic.
I think Steve is correct on the collar on the Season 2+ helmets, in fact the later Season 1 helmets have that. The early Season 1 interiors consist of a plastic harness taken from a hardhat (or similar), a padded inner shell between the visor and the wearer's head, and then the internal padding which appears custom made with black fabric glued over it (you can see a seam line in the back of Dom's in the Pilot as he gets into Airwolf). The front of the neck padding is fitted behind the mouthpiece so that when viewed side-on, the curves of the padding match the curve of the helmet (as in Probert's original sketch). Again, going back to the Pilot, when you see Hawke's POV as he shoots the Libyan guard off the roof, there is a very noticeable gap between the front curve of the padding and the outer edge of the helmet. There should be a jack plug connector in the rear left of the padding where the wire runs out of the helmet. The mic wire and oxy cable run BEHIND the helmet shell in early Season 1 and not along the bottom edge.
The correct paint colour for the helmets, like the helicopter, is NOT Phantom Grey Metallic. This colour information originates from the fandom and has never been officially verified by anyone who worked on the show or in production materials. Andrew Probert is the only one to ever say anything definitive about the colour and he has always maintained that Airwolf's colour was a Dupont Fleet colour, it was an AUTOMOTIVE paint and it was a shade of GREEN. I painted my helmet Phantom Grey Metallic and it never seemed right. I've since painted it Toyota 6U9 'Greyish Green Metallic' and I'm happier with that though I don't think that's the right one either (it was first used in the late 2000s I think so unless it had an '80s equivalent...). Airwolf would have to have been painted in 1983, but it would likely have been painted with the previous year's paint as a cost saving measure. Sure enough, in the Dupont book for 1982 there's Toyota 6G9 Light Green Metallic which is a likely contender, or possibly the darker, solid colour 6G8 Dark Green with a Metallic lacquer finish, or possibly even 6G1 Dark Green. Anyway, the helmets are supposed to be the same colour as the helicopter, this is largely true for Season 1 but I think over the remaining seasons there was a lot of touch-up/respray work going on as you can often see that helmets are different shades from each other. Colour matching from the original helicopter's body panels can't be trusted 100% because of the paint fading over time, likewise colour matching the helmets can't be trusted 100% not only because of fading but because of respraying with the wrong shade.
Photos: My helmet in Phantom Grey Metallic, prior to being repainted; original PGM; new Greyish Dark Green; half and half with the PGM on the left.
(I've never gotten around to doing a visor or padding!)
EDIT: I should mention I modified my helmet shell to have a season 1 style slimmer mohawk and no raised switch panel, it's not a true S1 though because it's a totally different mould.