Hey Dan,
I've had a VV mask for almost 15 years and love it. Bought it brand new from *******. The construction is fiberglass with Kevlar reinforced forehead and chin area I believe, but I don't know for sure. Never had any problems with it! I, too was looking for a cat-eye cage, but had no luck.However, I recently sent an e-mail to Tony at Otny Wire about a custom cage and have had a great experience so far! Here's the link:
Otny Enterprise LTD - Specializing in Wire Products - Home
He said that he used to make cages for VV masks, so making a cat-eye would be no problem. I'm still waiting to send mine out, as I am playing right now and don't have a back up. Tony has been very fast, friendly, and very helpful - he has even gone out of his way to reach out to someone who can refurbish my mask! Once I have all the info, and have a break in my playing schedule, I'll be sending it out.
Hope this info helps!