I have included pictures of my telescope tube mould bagging attempt.  Currently struggling to hold a vacuum.  The setup is envelope bagged, using a single 5m length of bag material from EC to save on joins.  The bag goes through the inside of the tube then around the outside, with a single join at the end.....

Is there a better way of doing it?  I am asking because this is my second attempt with no success.  My first attempt was to line the inside and outside seperately.
The other end.....

The inside, vacuum pump end......

Also, the outside of my mould has internal corners that the bag struggles to close up to.  Should I eliminate these with a fillet?....

Thanks in advance for any help people.