Using 0-degrees incidence on the wing will force the airframe to fly in a tailheavy condition. This will hurt performance of an F3A airframe. I'm assuming that on the stab you mean to put anhedral in it. If this is the case you can accomplish the same effect by lowering the stab height relative to the wing, but anhedral sure does look cool. That one is a matter of prefernce really. Will it fly? Yes... but then again you can get a sheet of paper to fly, it's a matter of what kind of performance you're willing to accept. The argument between 0-0 setups on the wing and stab versus positive-incidence setups will rage on as long as pattern exists. In my opinion the positive incidence airframes have a more "locked-on" feel, and they definitely snap better because the CG can be moved forward.