Mounted the GAD27 (Electronic Adapter Unit), the GEA24 (Engine Indication System) & slipped the GMA245 & GTR20 (Audio & Comm) into place. Once the wiring is buddled, organized, and secured; I will bolt the vertical stack permanently to the two support rails.
Interestingly, with all the left side boxes mounted, their connections made & the wiring somewhat "disorganized"; it is amazing how little space is left in this left bay.
Of course - I'm to blame. This is one hell of an avionics panel..!