Hey, Bonzi -

Our Renault dealer here (NL) says that there is a special moulded pod available for CARIN navigator installations in the Twingo. This is basically a pod that sits on the dash with a DIN slot in it for the CARIN head unit. Ask your dealer.

I have also seen a small roof pod for mounting switches and stuff for the R19, which has a similar roof console to the Twingo. I don't think it is DIN depth, but it's also available here.