I just made a Strat pu with some Invader-style poles (but even bigger). I had to use ceramic bar mags. It sounded pretty good, plenty wide and beefy but still twangy, but it just doesn't have the sweetness and 3D complexity of Alnico. Too opaque for my tastes.
I replaced the ceramic bar on the neck side with a 3/8" wide Alnico 2 bar (believe it or not, it will fit in a Strat single-coil cavity), and that improved it significantly, but still not quite up to snuff. Can't put a 3/8" on the other side, not as much room there, so I can't try it all-Alnico.
So am looking at getting some 1/4" wide Alnico bars made but I'm not sure they'd be strong enough. A Tele version might be wide enough to use slightly wider Alnico's though.