it is the same as their fx200 non insulated and should be the same as the fx100 mostly. the fx100 front window is eye level to look straight ahead for the most part, maybe has you looking down some from the horizon. same with the rear window. the side vent/windows are higher, but tall and narrow mesh with a wind flap with velcro to hold them in place. it would depend on how tall you are and what kind of add-on seating you might use like a stadium seat to have a back rest.
shappell uses 1/2 emt conduit and easy to modify because of that. you can raise or lower the bench seat. i made wind bars to hold the front down on strong wind days using their clips and the conduit. i did have to build up the clips with electrical tape and pounded the conduit shut on the clips. i made one for each section that moves.
they use removable windows too.
hoping they make their most popular fx100 into the insulated version. both version are 600 denier fabric.
i recommend getting their hyfax kit. makes them pull much easier (in a few inches of snow or less and slush) and way less noise and saves your investment. it is reversible so you can flip it around and get nearly twice the use out of them. they use the best hardware too.