Thanks for the response on the increased height - I also think it would be handy. On the "alpine" windows - I like them but wonder about there value when they are used in the rear area which doesn't provide any seating - on the old series rovers they were forward for the rear passengers - right? On the discovery LR they were in the rear - but they had seats back there too.
I had a 1965 VW 21 window bus when I was in college - the roof windows (eight of them) were great - especially when sleeping in the back - it also had the huge sliding sunroof - so lots of options - but my favorite was the window right above my left shoulder while driving. Guess it would be hard to offer something like that unless the shape of the roof was much different...
The Alpine windows add a lot of light into the cabin, so I think the rearmost ones would be useful for the cargo area in the back, but the way I plan to make the mold for the roof panel, the roof can be assembled with any combination of Alpine windows to suit the needs of the particular Jeep. This paper concept model shows 0, 1 or 3 Alpine windows per side, and even though it's not shown, the roof could be done with only the Alpine windows above the rear doors and not the ones over the cargo area, it just depends on what someone wants or needs.
Also this model shows a sunroof, I'm debating whether to also add a provision for a sunroof panel over the second row of seats. I'm thinking that sunroofs with removable panels could be installed to give a bit of the open air roof feeling.