The boards are sized to fit a 3x4x5" minibox as shown.
The RF amp and its controls are on the left side of the shield. The
shield is essential to keep 3496Hz LO signals from reaching the input of
the RF amp. The two battery holders are mounted outside on the left
and the phase-lock alarm is on the right. The 10 turn "knobpots"
for RF Gain and Null are old surplus units I had on hand. The rest
of the layout is not critical.