Hey Doug,
How much interest would you need to make it viable? There has been a few sets on Yahoo! Auctions over the past year but they seem to have shot up in value lately. I have tried bidding on a few but missed out, haven't tried to win a set in a while though.
I am not sure how tricky the chrome trim rings will be to make. I'd imagine you would need to shape it and tig weld it together, not sure if you'd use stainless or another material?
I keep forgetting to ask the teacher at Tafe, will try and do it next time I'm there. But I won't be there for a couple of weeks. Traveling next week, so will need to be the week after.
I am not sure if locally we would have much demand but I think the North American and Japanese / European markets might have interest.
Supposedly there was someone doing reproduction sets in Japan, but I'm not sure who?
http://www.classiczcars.com/topic/29086-repro-headlight-covers/
I could ask around..