Condenser mics generally are very sensitive, capture every noise and are somewhat biased toward higher frequencies as a general rule.
Honestly haven't tried it, but inside might not be a great solution, probably boomy and not a very desirable tone, while close mic'ed outside similar to what is shown in that image might work pretty well tone wise, but be aware it would potentially capture a lot of surrounding/background sounds as well as the desired acoustic sound of the instrument.
Every solution seems to involve a balance of compromises. For recording, in a quiet space, preferably not too "lively" of an acoustic space, that arrangement should work well. (Depending of course also on your intentions for mixing or post production processing etc.)
For recording live with other instruments, you might consider a more directional mic that isn't likely to capture the sound of a car going by a half mile away..........
OK, shorter answer: Depends.
Not yet. But I plan on inserting one deep into a heel lamination, tightly packed in there just to see what the results would be for blending with a pup and a piezo.
I have no idea what the results would be but I wanna try it!
Please come back and tell us how it worked. Will it switch so you can hear it isolated?
It won't be for a while. I have some xmass stuff to build. My plan is for a 3 way blender with each having its own volume control, so yeah I hope I can have each one on its own or have all 3 at different levels.