that is pretty full on compared with mine... I'll have a good read through
later though to see if I can pinch any ideas or tips.

My version 2 is simply a flange that clips on the top of my backpack vac
cleaner with a perforated floor, the mould drops inside, then a sheet of
plastic is put across the flange with some bulldog clips to hold it in
place (I was using a staple gun, but they are a PITA to remove) - hit it
with the hot air gun for a couple seconds, then turn on the Vac.