Couple of things kev, First on is the ratio of master boresize vs slave boresize. The last car i converted to hydraulic clutch was a total brain ache, I had about 6 inches of pedal travel (if i wanted to keep the pedals all at the same height at rest) and struggled to find the correct ratio of pedal movement vs clutch arm movement while maintaining a clutch that was not to heavy or to light . Or one that was so light it never released the clutch and one that was to heavy to be practical for driving. Got there in the end but not after going through a dozen different combos of bore sizes. Next thing is to check that the torque movement of the lump under load wont get that slave rubbing and buzzing on the chassis. Looks like you could get a rizla trapped in there
Just thoughts
Bob
Edit. dont trust that plastic waste pipe kev the stuff age hardens and splits.