I ran my fuel line and control harness line up and over the exhaust using the existing heat shield and one of the cross-members of the body (attachments only to the body, not the shield) I don't have any good pictures because the camera I was using during the first stages of my build has died, and my wife's smartphone takes useless shots. But I found a fairly good path that isn't "continuous rise" but does rise overall. There is a dip from the KL-1 auxiliary tap down to the pump inlet, and then it is up-or-flat from there. I don't think you need worry too much about this (I did, and I think it was silly to do so).
I find the noise from the D2 on full blast a bit excessive, but once it settles into its low power maintainance mode, it is very quiet.