I recently tested the bridge HB on 3 guitars with a scope.
"Normal" strumming gets rarely above 0.2V amplitude.
If you bang on the strings like a chimpanze, the attack is about 0.5V amplitude but goes down to 0.1-0.2V amplitude after only a swing or two.
That's not music, that's pick attack noise.
I build all my circuit models with 0.1V amplitude and then I check what happens when I raise amplitude.
As for including pup characteristics in the model, there's a good read here
The voltages I mentioned would obviously be after
this circuit snippet.
The snippet is not really necessary IMO unless you build something without input buffer or very low input impedance (some fuzz', some wah's ...).