Heavy, I'm not exactly sure where you're referring to when you say cubby holes inside the fairing, but I know that on my 2015, there's not much room to do anything under that fairing. A lot of stuff looks like it will fit under there, but the outer fairing is pretty tight to the inner fairing. Remember that even if you can squeeze an amp in there, you'll still need clearance for the cable ends where they plug into the amp, as well as the required wiring and a line leveler if your going to use one. You don't want any sharp bends in your hook up cables, they'll end up breaking or breaking the amp terminals due to vibration. I had one come unplugged from the amp last summer.
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2015 Denim Black RG, FM ss ceramic coated 2-1-2 pipe, White Bros Original E Series Mufflers, FM ac, PV Tuner