Miilor - Ribble Kits have closed down, even though the "Sammio" website still looks open.
Micky1Mo is the new owner of the Sammio brand and his company is called Replica Rides.
( I believe both the Sammio name and website will be re-used in the future. )
Contact details here:
http://www.replicarides.co.uk/replica-rides-contact.php
There is some information about plans for future kits here:
http://www.madabout-kitcars.com/foru...ead.php?t=5058
But I couldn't tell you if either the old Sammio Spyder kit, or the 2CV version are still available.
Although I do know that the Sammio Cordite / Ribble Navigator is definitely not available.
Sorry if that is a bit vague, but hope it helps.
Good luck, Paul.
PS
I don't know much about using a Renault 4 as a base either.
But I do know that you can make some drastic changes to the body work in order to make it fit.