I dunno if this has been mentioned before, but I have been tring to scratch-build a helmet and was pondering the dome...I thought it looked familiar and that I had owned a motorcycle helmet that was similar.
Well, I did some digging online, and found that yeah, a classic British cafe racer helmet is the perfectperfect dome for a Mandalorian.
Check it out:
The brand is Davida, the model is the Classic. At $230, it's kind of expensive for a scratch-biuld...but if one could find an old one on Ebay or whatever, it might be cool to cast the perfect dome.
Here's a link-o.
BTW, new here so if any of this is not allowed, let me know.