I got one in OpenRocket to hit 58k only. That's using same motor combo you listed above, but a 4" MD first stage, a 4" second stage, and a 3" third stage all 3 and 4 clipped delta fin design - trying to keep as small of fins vs weight and achieve around a 1.25-1.55 stability. Each one has dual GPS receivers as well as dual altimeters for recovery. 215" in length - mostly for motors and accommodating room for shock chord and parachute based on FC's packaging dimensions.
Its long and foldy. :| There may be some areas that could be tightened up a bit, like use of more compact horizontally stacked instead of verticallly stacked altimeters (I just grabbed my current working avbay and reused)
I was mostly just curious - I'm only working on L2 now, so any look at doing something like this (probably not that interested really unless huge group project) is quite a long journey off.
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