Correct Flat Six, different subframes and the part needed to mount that is missing on our bikes. I was following this on one of the forums, don't remember and can't find it. I did see the same photo posted on a Goldwing forum recently although not the original thread. I believe it required a bit of modification. I wish I could find the pics to show here, especially with the different frames.
It's different, but it's all Honda. Kind of like an basic F6B without the gadgets? Sure would like to see the thread to completion and see the final with paint.