Would this work?
I mean if it did that would make his overall stats very high.
Wouldn't this give scyther 120 in both defenses while still having a base of 105 in speed and 110 in attack?
It would, but do you really want to have a Pokemon built for sweeping be a wall? And a very poor wall at that. I mean, Bug/Flying typing isn't the best walling type. You're better off gving him a Life Orb. He has Technician remember, so his moves do more damage than you'd think.