This PCB has 5 circuits:
Active low-pass filter
Active high-pass filter
Active bandpass filter
Summing amplifier, two inputs
Differential amplifier, two inputs
Power input:
Either +/-5V which goes to two +/-2V5 linear regulators, or connect directly and supply +/-2V5
SMA outputs have 47.5 Ohms series resistance.
I have included a 3D printed tray to hold it. The tray uses 4x M3 heat-press inserts, and secures using 4x M3x10mm screws.