Is it your circuit design?
The unit is, but the stages are stock standard.
It's amazing how many things you can do with 3 or 4 stages.
An LM386 is used as either a DC amplifier (to drive a meter movement) or an audio amplifier (for a small speaker). The latter is used for the signal monitor or audio signal tracer.
A diode rectifies RF to DC (or in some cases audio).
A crystal oscillator switched between a few frequencies provides some spot frequencies for receiver testing and a local oscillator for the SSB transmission monitor/WWV receiver.
A tuned circuit (variable over a couple of common HF ranges) is good for the absorbtion wavemeter and receiver.
And the meter movement gets use for the RF power meter/dummy load, field strength meter and absorbtion wavemeter.
About the hardest challenge was switching all these without too many switches and there were some compromises.
Though not the main subject of these videos, it get some use in them: