My original reference was the devices from the anime, which appear to be a bit thicker in the lower half. This is roughly the best side image I can find.
It’s hard to find good reference material from the anime, without having to watch through the entire series trying to find a scene that shows the necessary angles; it’s mostly shown front-on or obscured by a hand. I’ve used the real-life devices as my reference material to make up for this. Still undecided whether to push more in the anime or real-life direction.
At the moment, the model is destined for a SteamVR Destination, which wouldn’t have a problem being split into multiple meshes, as I can make one or more separate, super-low-poly collision meshes. I’ve not actually thought about how to splitting up the parts, as my mind tends to see the whole thing as a single object, therefore a single mesh. I’d say the most logical thing would be to make the buttons as separate meshes so that they could be movable, if necessary. Also, I thought about making the cut-out for the power button and keep the “plug” as a separate mesh on the right hand side, allowing me to cut the model in half and use mirroring.
I’ve not had a lot of luck with booleans, and I’ve found I often get poor results. If I remember correctly, they have issues if a mesh is not completely closed.