double hung windows, that can be removed for easier cleaning! ok second thought on that one, just windows and doors that can be easily removed, for both cleaning, and/or for air coming through. to easy to mess up the little latches that hold windows/doors open a little bit. i rather have a box, than something all curved up window.
instead of a generic piece of plastic molding inside for doors and windows, an actual metal piece, with some holes for attaching a holder (phone, display, glasses, etc..)
removal-able quick release seat. so i can clean around the bloody thing easier. its like trying to clean between bucket seats in a car/truck and the center consul, it just doesn't happen, or less you want to loose some skin on your hands and end up in a funky position to clean down into that area.
move the bloody "fill / check" locations for transmission / rear end, OUTSIDE OF THE CAB!!! not fun breathing in some spilled oil inside the cab. not to mention the funky triple hand-er trying to fill with funnel and bottle / jug.
if your going to run vents and wiring in everything, then make it so we can actually tear the stuff out and remove dead mice and there nests!
it would be nice if a lot of the "industrial equipment" like setup, was transferred over to "agricultural" cab tractors. a lot of it has already been figured out, no need to re-invent the wheel. exception for smaller size machines.