Found additional photos of a power supply I built for the GRC-9 and BC-1306. It was assembled in a French Med Aid enclosure that I found at the Aberdeen Military Meet one year. The large heat sinks for the low voltage regulators are a little over kill but I used what  I had on hand.  The GE mobile power supply is mounted in the rear and a air vent was installed near by.  The supply gets warm so I just pop the lid for extended ops. The Red covered switch  is the master power.   Two photos attached. “au revoir”.
K4CHE