My JS-1 visor arrived earlier this week. I covered it up with blue painters tape and trimmed it down to fit. The uncut visor is approx. 12 inches wide and 6-7 inches tall. I then covered the blue tape with electrical tape (so the bondo won't stick to it) and installed it temporarily. It fit better than I expected. The largest gap was only 3/8 of an inch.
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I found some foam weather stripping at a garage sale and used it to add some of the details to the back of the helmet. It created a mold of the area that I wanted to raise. The foam was real easy to remove from the helmet and left very few pieces on the fresh bondo. The pictures below have not been sanded.</div>
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My next update will be when all the details are done. This may take a little while. Stay tuned.