Check out www.micromark.com

They sell a "hole saw" set quite reasonably (less than ten bucks) that will cut neat holes up to 2", I believe, with any ordinary drill.

I'll be ordering that item myself; next up on my board is a Sig SkyBolt, and that one builds tali heavy as well. This hole saw set should be just the ticket for lightening the tail feathers and rear fuselage.