I had (and blew) and opportunity to buy one of the four Proteus 300SLR replicas a few years ago when I purchased my C-type. The seller and I were going back and forth on the price and in the meantime someone swooped in from Europe and bought it. These cars are absolutely beautiful, with a hand made alloy body. The same car has recently reappeared for sale at a substantially higher price (250K Euro)
http://www.carandclassic.co.uk/car/C82718/