I have established a limited supply of these Mk1 estae shells.
They are built in resin by a guy who adapted a saloon die cast shell with an increadible amont of work. I havent seen one at first hand but from the pics and a detailed email, the guy is mustard.
THEY WILL NOT BE CHEAP..... possibly around the £40 mark just for the shell, which will then need donor parts from the saloon.
I am also in talks with him to reproduce a Mk2 shell when we can suss out possible copyright issues.
Please leave a note should you be interested.