I have given that pattern to a mate who has mad pipe skills and some steel, he says he will do it for me, I wait eagerly for the result. I just mocked it up 3d, it should have 3 stages if he has the stuff

ah, brilliant. I wonder if you get any clash with the exhaust. Mine will be tight.

You inspired me and I have just tried one o'clock, though of course I had to take the tank off first. It is good because it means I can set my engine low...and I imagine that chain tightening can be done either by tipping the engine back or by raising it whole. That position also gives me more room to move and may even mean I can move the seat back a tad.