Why do this if it doesn't matter much to the AFM (heat aside, for a moment)?
Simple. It would make things much easier to route, as in, air filter at the turbo inlet and not worry about IC piping and the AFM interfering with one another.
I'm not planning on running terribly high amounts of boost, but thinking about the assumed "delicacy" of the AFM, why not run one off of, say, an FC RX-7? From what I read, I understand that the non-turbo FC AFM works, so I'm thinking an AFM from a Turbo II or something of that sort might work.
Me doing this as cheaply as possible (not necessarily because I'm a cheapskate, but I'm curious to see how inexepensively I can do this) chances are that I'll be giving it a shot with the stock AFM, either between the turbo and the IC, or after the IC, depending on what IC I end up using and how IC piping will be routed.
If anyone has more input on this, please, drop some knowledge on the sit'cha'ayshun 8)