Tonight was 4 hours spent measuring millimeters and trying this bird on for size. I was SHOCKED how little room I had to move my head around inside the canopy with my headset on. I was able to conclude that my seating postition was probably a little too high so instead of raising the canopy I moved it forward 1 inch from the plans and cut 3/4" off of my seat foam and finally things felt less constricted. Still, being in a berkut basically ruined me :)