A
small solder lug was fastened to one of the the wood ends for strain relief
of the B+ pack wires. 
Tie
it off with lacing cord. 
Connect
the 9 volt batteries in series, use heat shrink,
I like the heavy duty 9 volt connectors the best. 
I fabricated a Power Distribution Center (PDC) and fastened it to the inside of the top cover of the battery. Shown is the top of the battery connector and the bottom of the connector and the PDC.
Use
your Dremel tool to etch the PC board in three sections for your PDC.
NOTE: The original wiring for the B+ line was removed
and replaced with a brown wire. The original B+
wire in my pack was gray. The other wires shown are the original wires
but be sure and check your connector and trace out the wiring.
If you use the
original wiring be sure and check the solder joints on the connector and
resolder all connections. 
Leave
plenty of wire on the filament and HV packs for ease of maintenance. I had
to shave off some of the round connector housing for proper clearance of
the 9 volt pack.
I love the smell
of zinc chromate in the morning.