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Use $10 drill press from your local hardware store and a dremel: http://www.thingiverse.com/thing:1654673This allows perfect holes at 90-degree angle
Your build could have looked so much better if you have invested just about $2 in a cheap mixer for a hand drill (or, better, stronger mixer with SDS+ tip for power drill). It is almost impossible to mix concrete with a stick in large amounts - it is damn hard and takes too much labor. If you had used that, all surfaces would be so much smoother and concrete would be stronger.
Don't underestimate the weight of the concrete - it can break your styrofoam. Plywood is a smarter choice.
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