I'm afraid I don't really know anything else. I believe they were factory built rather than kits and they seem very professionally made. Each car I've seen is very individual and I'm assuming they were built to order. There is one in the UK that is being restored by a Mazda MX5 nut after a heavy front end smash.
Front end looks a little clumsy, but the back is very neat. Looks good with the hardtop too