Wow orpheo... Sounds like you really know your stuff! Thank you for sharing. One of these days, I really hope to have a lot more money so that I can build hundreds of pickups using all different kinds of magnets, wire gauges, pole pieces vs. lugs, P90s vs. strat style single coils, and I'd also love to have the cash to own or at least play guitars that have all of these different magnet types and such.
I am now completely convinced that I want to make a pair of Filtertrons.
I have found several Filtertron Pickup Kits like this one from Philadelphia Luthier Tools . Do you know where I might be able to read more about the actual specifics of winding one of these? I think I may go with Alnico 2 in the neck pickup and Alnico 5 in the bridge pickup.
I do not know, however, how many wraps I should shoot for per coil. I also do not know if there are any other considerations like, magnet polarity, wind direction, skatter patterns, winds per layer, etc. Do you know where I might be able to look for information this detailed?