I've had a few enquiries about hexagonal pattern grill in the past and have decided to get some in as a trial. The sheet is 1.5mm thick and is 6mm hexagon perforations with a 64% open area.
The bad news is that it only comes in 2000 x 1000 sheets so will only really be suitable for cabs less than 500 wide and/or 1000 high. Obviously they can be made bigger but will be pricey due to the waste offcuts created.
I'll add a pic soon.
I've also added 3mm foam to the stock..... apparently used on the inside of some EV grills and also inside Sennheiser cans.