So with inner cup sabers like this, it's pretty easy to do a pixel install with a recessed pcb in the blade. Generally what you would do is cut the pixel cup down with a pipe cutter or lathe to have a depth of the led heat sink cup to 8mm. Then there are a number of pogo pin PCB holders on shapeways from wolf69, Goth3D and shtokyd.
the Blade also has a recessed pogo holder that sits inside the blade tube some. This lets you make use of the entire emitter depth while still allowing a pixel.
the hilt side winds up working like attached.
This is a MK1 that has a similar type of heat sink cup to
Anakin Starkiller's hilt.
Punchline: pixel install totally possible and still leverages the entire emitter socket. Some very minor modification to the heat sink cup is all that is needed. (And if you have access to a 3D printer you could build a hilt side holder that is the same depth and would not even need to modify the heat sink cup. Some of shtokyd's pin lit connectors also won't require mod to the cup.
btw Dan. Hilt looks great!