All the specs you've listed look good, and should work fine. There are two vital numbers missing though.
What size are these steppers? 1.7" between bolts (indicating a nema 17 size) or 2.3" (indicating a nema 23 size) or what?
How much torque are they rated at? They're almost certain to be strong enough for the axises. The extruder requires a little stronger motor, and a randomly selected nema 17 motor has, I think, about a 50/50 chance of being strong enough to use for the extruder. (that last bit is just a guess)
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I'm building it with
Baling Wire
