Thank you
With the middle seat removed, armrests would be nice and some sort of USB charging pocket too - like you've built in your armrest post but even cooler if powered from under the seat somehow.
Given that the seat belt and seat occupant wiring comes up from the floor, I'm sure it is possible to run a proper fused power line under the factory carpet covers. You may need to re-glue the carpets back on though, or devise a velcro replacement (so you can service the line if needed).
The cupholders in the doors work okay for my kids so that's not a thing I'd be needing and in fact, the access to the 3rd row is almost entirely done between the seats instead of tilting the side seats forward so I wouldn't want to restrict access to the 3rd row with the width of a cupholder. So if I did find any armrests, I'd want them to be really narrow.
The arm rest I bought can be oriented inwards or outwards relative to the seats, because the telescoping post is mounted slightly offset from the arm rests. This picture below shows how the arm rest top is offset from the posts; attaching the arm rests the opposite way would practically consume no aisle access space at all. You could make that a default orientation unless the occupant wants to flip it afterwards. Flipping it is a matter of a few seconds.
Having said that, given that the aisle access needs to clear footwear and maybe up to calf level height, I don't think a lot of clearance is needed. Even with the additional cup holder I tried, there is still ample and easy access in and out of the 3rd row via the 2nd without moving the 2nd row outboard seats.
Also, the inboard arm rests need to be wide enough unless there is a lip on the outer edge to help keep the arm from falling out. On the OE door sides, the door's wall serve that purpose.
But the thing that is most missing in my XC90 is a place to put a Kleenex box. Ideally, I was thinking it'd be cool if somebody could create a 3D print model to fit a Kleenex cube immediately behind the front center console so the front seat passengers could reach around to grab a tissue. It could sit on the floor and have sides that extend over the sides of the center console to mount it. It'd end up right in front of the lighter port on the back of the console so that would need to be turned into USB jacks on either side of the Kleenex holder. The placement behind the center console would mean no legroom for a middle 2nd row seat - but with the seat removed, it doesn't matter.
Alternatively, the aft plastic panel of the 1st row center console (pictured below with a USB adapter occupying the 12V DC socket) has some space behind it. Perhaps it can be modified to house a half height box and a slot on the panel for the dispense.
I saw this ebay picture of a center console from the bottom view. The metal frame and that aft plastic panel has a bit of a gap.
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A standard box fits between the 3rd row seats:
You lose the "storage space" that the box sits atop of, but that's not too bad imho.
