if i were to build a HH style guitar, would the following be possible: have it wired so that there are 4 on-on switches, each one wired to a particular coil, and each would activate/ deactivate each coil?
shure that's possible to wire. I could even imagine a switch for out-of-phase (on-off-on) for each coil. You could combine them in parallel or serial - but you have to decide that when soldering it together...
What you're describing is actually a bit more complex than meets the eye. In its simplest form, you'ld have both coils in parallel when both switches were on, rather than the "normal" series mode.
What might be better, (which is what I had at one time), is to use three DPDT switches. One thats on-on-on to select between either/or pickup.
And the other two on-off-on, to select between either coil/series mode for each pup.