Hello.
I am currently building the 1967 Gurney Eagle in 1/12th scale.
I am using two Tamiya 1/12th scale kits to do this conversion.
The first kit is Tamiyas Honda F1. The body of the Honda kit is used as the base for the Eagle body. A lot of filler was used to re-create the eagle in both the main tub and the nose. I also used the engine, gearbox, and wheels from the Tamiya Matra kit for this conversion. (highly modified) There is far to much to tell you how I am doing this but after 6 months of working it is almost completed. The conversion will be featured on www.modersite.com in the next few months.
In the meantime I can send you some pictures if you like.
email me at tanatam@aol.com
The only other kit I know of Dan Gurneys 67 Eagle Weslake is in 1/43rd scale. It is made by SMTS of England and it is very nice but also very small.
The Lotus 49 is long out of production so I doubt if anyone would still stock this kit. Ebay is your best bet.
Stuart