Thanks Stefan,
Yes, I know, You think you're almost there and then something slows things down. I spent a lot of time looking for something to adapt for the curved tail section but eventually bit the bullet and made a fibreglass moulding. The pictures tell the story but basically I made a plug on the kart using papier mache, took a reversal in fibreglass as a mould tool and then moulded the part. Turned out quite well really so now I can get back to putting it all together and painting it. I'm determined to be ready for next year !!