She'd be a good one to mimic!
Cd 0.309 if memory serves me.
Only RIVIAN and CYBETRUCK are lower ( except SPIRIT ).
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If you left the bed open, but with the flying buttresses, you'd be sequestering the vorticity and turbulence within the confines of the cab roof, sides, and tailgate. If you're never going to haul sheets of plywood or the like, the width inside the box is less of an issue, allowing plan-taper of the buttresses, for more drag reduction.
For times when you weren't hauling 'tall' loads, you could panel in the upper opening to the 'vault,' creating the, circa 1982 slant-back topper CYBERTRUCK is riffing off of.
( C-channel attached to the inner faces of the buttresses could receive 10-mm
Coroplast, slid in from the open tailgate ). Cheap 'n Dirty!
My brother does this on his Tundra with custom-made steel panels.
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You'll create quite a 'blind-spot' to the passenger side. And even if you glaze that buttress, there'd be no way to 'defrost' it.
I drove 18-wheelers in the Air Force, and got a CDL when I left in 1975. I'm okay with only sideview / blind-spot mirrors.
