The idea behind the built-in Pep file/model supports is that they're only kept in place during the resining/fiberglassing process.
Once you've finished with that step, take a Dremel tool with a cutting bit attached and remove it from the helmet. That's what I'd do, anyway.
I like what you've done so far on the suit. We rarely see anyone try out the earlier Mk V armour (there's maybe been two other attempts from what I've seen). Have you made any progress since your last post?