Ok so I have resisted doing the tub as its a huge amount of work... Ive made moulds and composite panels for the Front & rear clams, doors and front wings.... I wrapped the roof and window panels on the Tub which looked ok but not perfect and there was clearly no benefit other than cosmetics and it never really sat right with me.... I felt I had left the car unfinished!

I started making the barriers for the first mould section.... Care must be taken to ensure the mould will release from both the buck AND the final part. You will always make the final part slightly oversize so it's very easy to accidentally get a lock on the overlap or the other mould sections.