It looks like the maximum feedback is 0.9 for that block, so it won't ever do infinite.
See
https://github.com/HolyCityAudio/SpinCAD-Designer/blob/790bbc8f97145930e75c67051238e7f262197758/src/SpinCADBuilder/MinReverb2.spincad#L13
I didn’t know much about fuzzes, but as a first step I knocked together three Ge fuzzes from Aion and they all work perfectly and sound great. From there you can start tweaking, making adjustments that you might like etc. Or just play ‘em.
Does the x100 feed one tap back or two? That would make a really big difference in the sound. 1 tap feedback would be constant density and 2 taps would increase the reverb density. The network you have here is actually constant density, despite feeding back two taps, which is a little odd for...
Even better would be if the docs divided the parts into stuff you already have a thousand of (10k resistors ) and shit yer definitely going to have to buy to build this (dual ganged pots in weird values and some transistor from 1967). :)