Just read this whole thread while my wife binge watched her tv show. Not a clue what the show was even about considering how jaw dropped I was seeing what you have done. Very impressed, The bike looks amazing. Nice touch with the magnesium frame color match looks very 916 as you mentioned .
I saw this post today on Reddit and here’s another option you can go with if you want to stick with termi exhaust. Thought it was pretty unique.
https://www.reddit.com/r/Ducati/s/l56971d4FB
Also here is a clip of my current v4s setup with a spark full Ti system , the cans are stacked closer and shorter than the Akra type wheelbarrows , I too have ocd and didn’t like how they stuck out past the tail fairings . Also awaiting BST gloss carbon wheels to finish the build.
Ether way can’t go wrong with the one you mocked up above will look great as well!
Keep the post going! would love to see some outside sunlight shots showing off that frame color!