I love these builds and the flight footage.
A new and interesting data point: I threw an APC 5.2x6.2 prop on mine with a 3s350. You have to be really careful about the motor overheating, but the performance is absolutely incredible. It's getting right into the 100 mph range with that setup, and you still get very good flight times, around 8 minutes, since most of the time is still spent floating around. Or carving around in my case, because I fly it like a hotliner.
The little HK folding props are still king for flying it as a soaring machine though, on the 2s300 batteries.
My next one is going to be covered in Doculam or something like that so I can throw lights in it.