I needed a pommel of some sort to help keep the weight balanced. 

Initially, I just made a storage box that would fit my laptop charger, or extra cables/tools. 

This was basically perfect, and painfully over-engineered. The "lid" of the box has a slot that lets the box seat easily, without needing maker-beam to attach to the far side of the box. This was good, but I was ahead of schedule, and I was going to VEGAS for a hacker convention (I HATE VEGAS SO MUCH). I had to kick it up a notch.

BAM! This little box houses a "PIQO" projector that I'd kickstarted a few years back. The projector is mounted inside a free-spinning cylinder that allows for Y-axis adjustment, while all necessary controls remain accessible. The projector also has its own batter, good for about 2 hours, though it can also be powered from the connected powerbank.