[Boatanchors] Smart People: BC-9A Opinions Needed

[David Stinson]

Good morning.  There's precious little specific 
information technical on the WWI-era BC-9A
 (SCR-77A) battery-operated, portable CW set.
Some general descriptions but no 
clearly-copied schematic.
https://goo.gl/photos/uVYek56Zoja1jqQq6

There is a schematic on the inside of the cover, 
but mine was stained and missing a large part
 of the center of the diagram.  I have worked 
with what I could find to re-create the diagram.
Please look at this photo.  The re-created part
is in the green outline.  It is close to the smeared,
obscure copies I've seen but not certain.  Does
this circuit make sense to you?
https://goo.gl/photos/RCMKFHrZKZBHoeLc7

Next:  I'm working on power supply solutions
(other than the obvious batteries.)  I need to do 
some RF bypassing in the supply lines and need
a point I can call "Ground" in this circuit.
This diagram- Red lines appear to me to be
what one would think of as "RF Ground," while
the 120 and 40 B- lines reference in green.
That puts B- above the "RF Ground" by 
the filament bias, adding to the grid bias 
on the tubes.  Do you think my analysis of
the red line being the place I could think of 
as "Ground" is sound?
https://goo.gl/photos/bucwyMuC12jdfWWT7

Thanks for your input and prosper in 2017.
73 DE Dave AB5S