Hot Toys and their Vader helmet sculpts. What a sad story (not unlike HT's Boba and stormie helmets.)
All of them 10% oversized (along with the armor), domes slightly off, every one with its own set of issues. How on earth they didn't fix the ANH/R1 rounded "points" around the nose for the OWK Vader release I have no idea, and the atrocity that is the ESB sculpt gets a straight re-release for ROTJ.
Using the surprisingly accurate (and more accurately sized) Kaiyodo parts often doesn't work due to the overscale HT parts and overall figure size.
It is all so much work, I fixed the button nose on the ESB sculpt, but that leaves the sunglasses eyes, yet even the ANH needs a push-back nose job while you're sanding out those "points" plus the neck line.
Two new HT Vaders, two not-so-new flawed HT Vader helmets.
We all do what we can until someone comes along to finally create a truly spot-on Vader helmet in 1/6... Too MuchGarlic, your accursed many-years-long project gets more important with each passing year.