In my very limited experience, high leakage in Q2 makes it bias at 7-8V instead of the usual 4.5V, which means it will have more treble while maintaining the fuzz tone - biasing a Fuzz Face that high makes it sound more like distortion.
It's TB MK1.5 vs FF.
In an MKII I want leakage so it...
It seems MP40s are the way to go for the MKI. What hFE and leakage did you use?
IIRC Q1 needs hFE 60 and leakage >150, Q2 needs hFE >100 and no leakage necessary, Q3 hFE >100 and leakage >150
I wouldn't risk her being around tools that you've touched after handling solder, it might have an effect.
It should be ok for her to drill enclosures and mount hardware though, in another room away from fumes.
Source: my ass - I'm not a doctor :)
Maybe she can help sort out your inventory...