Why is there so much cockpit-glass behind the pilots? Based on the way it is depicted doesn't really conferr much backwards visibility.
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Not sure how confident we can be about the finer details of the CG, but if the CG is accurate then perhaps J-36 is a four seater?
Could it be that J36 doesn't just have side-by-side twin seats but also a back row of one or two additional seats? I mean if you want to have four seats you'd want to have two seats on the front row. And that seems to be a major potential motivation for having a side-by-side arrangement.