So it turns out the visor will just fit on a Replicator 2 in one piece.
So here is a version that is perforated, to fill the gap before I get round to attempting to vac form a visor.
Intention here is that thin stretchy material can be placed over the visor and glued round the back to give a semi one way effect.
Added half versions, requires pins for strength and alignment.
Added full solid version.
To ensure a little strength, though not proven to make a difference, this is printed medium, raft, support, 2 shells and 30% infill.