After fitting the mock instrument panel, it became apparent that the Fatboy throttle grip was going to rub against the lower left portion of the instrument panel, so I removed and disassembled the throttle quadrant, and modified one of the bends in the throttle arm. After reassembly, the grip now clears the instrument panel by about 3/4", which should be enough. I also fitted the flap quadrant to check its clearance from the throttle. Everything looks great.
[Superseded.]