Sid Watson makes the wings - he uses moulds he purchased from David Rutherford when he packed up.

http://www.fibreglass-mouldings-cambs.co.uk/

He actually has the mouldings for a little known 4/4 competition model the 4/4 Rutherford lightweight. It uses a complete fibreglass moulding for the entire car body and replaces all the body and wooden frame - sitting directly on the chassis. There are a few knocking about and tip the scales at about 550kg.