Personally I wouldn't bother on areas that tiny unless there's a really good push-fit already happening on the plastic.
My view with magnets is that its nice to save money, but the model has to be functional, playable and the process of creation not too painful to make it a viable option.
Eg if the magnets are tiny the parts might wobble on the connection (annoying); if it takes forever because they are super tiny and you have to be insanely careful then its a pain to perform etc...
I've seen people magnetize everything on models going down to using loads of tiny magnets. Insane stuff can be done. However I draw a line at practicality. That's a very personal line and, obviously, some don't draw the line in the same place
For me there reaches a point where I'd rather just accept the limits of what I've built and have an excuse to buy more models.
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