The interior plywood reinforcement stock has been painted.
The D cell filament pack is in place and the cover is in place on the step.
The whole pack is now together. I used 12 cells, the B+
is a little high but as the batteries drain the voltage gets closer to 90
volts. 
Its easy to change batteries.
I made a canvas cover to keep the top closed. For further details see:
Here is Stew's (WA2AUI) aka Bud "stuffed' BA-48 shown at
the MRCA meet in 2002. Note that he took advantage of "chain linking"
the 9 volt batteries and has eliminated a lot of the connectors. He had
two stacks of 9 volt cells and two stacks of D cells. The D cells were soldered.
With all these batteries his pack should last about 12 years but they are
hard to change. 
Easy power for the GRC-109 receiver.