C'mon N2P.
As the first photo shows, you could block out several airplanes in formation with that much vision blocked! A GoPro is small, but so is relative traffic. If on a true collision course, an on coming airplane may appear to have zero relative motion to you, and thus "appear" to stay at the same angle of view - meaning a plane could stay blocked behind you GoPro for some time, unless you're doing the neck thing to constantly look around it (distraction).
The two pilots in the jet cockpit have twice the lookout power, and between them no blind spot, and they are flying in a fully controlled environment the whole time, with ATC traffic separation, and TCAS. They are not actually required to look out the windshield for a lot of the flight.
You mention using the video later for training, that could be very good if a qualified trainer is reviewing the video with the student(s). I trust that you don't just record the video, and send a copy home with each student, with the instruction that they watch it, and see if they can spot any errors! That's how poor training would be done! For the video you collect, is it your plan to pay your instructor their time to review the video with you? Wouldn't it be more cost effective to just pay them for their time in the lesson as the rest of us have?