Welcome to the exclusive club of Sammio ownership.
I've always been a fan of 2CV based kits, but you might find that your driving position will be very high in the Spyder as you can't really lower the floor pans due to the design of the 2CV chassis.
I'd recommend you consider that from day 1 and design in a suitable seating position - you could maybe mount the body 50mm or so higher up and use steeply raked-back seats mounted towards the front of the cockpit so you have a laid back driving position, a bit like this -
Anyway, good luck with it and enjoy the challenge!