Interesting ideas Leon. Not sure about the 6x12, 6x17 would be a lot more desirable as it really is a wide format. 6x12 is just not wide enough to be really different.
Depending on the price as always, i would be interested if wider than 6x12
That said, I enjoyed your videos of the 4x5 and 8x10 introductions and bought the 4x5 after viewing your video.