Bit like you Guy, I've no doubt early photos but easier to upload these fresh ones.
So the overall plenum.
Right side is the drivers side and as described the air inlet to the plenum is pointing towards the drivers side.
And a photo showing the profile, the driver's end nearest in the photo.
Moulded the fibreglass over half a pvc pipe I had curved to the underside of the dash.
Once I am happy with air flow, I plan to sikaflex the plenum in place to the under-dash.
Have thought of partly introducing a curved baffle that redirects air to the passenger side at the inlet tube.
Just means some fibre glassing once I develop a template that works.
Any other suggestions??