Hi nikostudio,
I just refurbished some spare parts from an old tower case (I removed the original Frontpanel PCB of the G5).
I used a USB Port and a headphone jack, that I gutted out of another old case.
Soldered some longer wires on (directly to the power button with the white LED on the G5) and glued everything in with some two-component glue.
Hope I could help
-theandy