So it turns out the visor will simply fit on a Replicator 2 in one piece.
So here is a variation that's perforated, before I get round to trying to vac form a visor to fill the opening.
Goal here is that stretchy stuff may be put over the visor and pasted round the back to provide one manner effect to a semi.
Added half variations, needs pins for alignment and strength.
Added complete variation that is solid.
To ensure just a little strength, though not proven to really make a difference, this is printed raft medium, support, 2 shells and 30% infill.