The top fin needs minor reshaping at the back (and red LEDs installed behind a smoked panel at the tip). The dome needs to be redone as a single piece, but is largely fine in shape and size. The rear half is largely fine, if the gaps to allow air circulation are closed and the "knob" is made more accurate. The vent panel below that needs to be redesigned, but that's the biggest fix the back half needs. I'd extend the undercut around the back edge, too. The front half needs minor reshaping of the side tubes toward the front, repositioning of the annunciator inset (and a more accurate annunciator), airflow gaps closed, side slits repositioned, and the lower edge of the visor opening brought up by an inch all the way across. The earcaps are fine and can still hide most of the front/back join. Rework the greeblies to be recessed.
All the stuff that needs to be done is relatively minor, as I found in my own cleanup of the piece. Given they start with a 3D model and engineer the parts breakdown in-computer before committing to a physical die, they likely still have the original files the produced that helmet from. All the tweaks I referred to could be done in an afternoon. Then it's doing the interior, play features, and the fun and lengthy approval process. It's apparent from the original piece they did that they worked from Lucasfilm-sourced assets in the first place. Everything matches too well, except where it was obviously altered to make it wearable by a human. The change in shape to not break one's nose is minor and would need to be done with a BS offering anyway, so why reinvent the wheel when they've already done that work?