I've never known anybody complain about too much power,so it is indeed a nice problem.Does your intended location have the capacity to make it work at peak efficiency?
There are a couple of aspects of the design that make me wonder;the location of the longitudinal ballscrews is a long way from the rails and there isn't a huge span on the bearings,are you satisfied that it won't tend to tilt the gantry when power is applied?Just the inertia of moving the hefty spindle will give it a series of jolts over time and cutting forces may contribute their share of wear factors.