I haven’t yet attempted a monostable circuit.  I was thinking of seeing if I could upgrade it from a “set/reset” flip-flop to a “toggle” flip-flop so I could use it as a counter (thinking of using the EAA91 dual diode block as a steering diode).  I was using the potentiometers to find the ratio that would flip and maintain states reliably, I’m hoping to replace them with discrete resistors to make it easier for others to build.