While I have a right-angle drill (a DeWalt) I frequently use this attachment because it has a very small offset. You can drill right up next to a bulkhead.
And, less than half the price.
http://www.amazon.com/Milwaukee-49-22-8510-Right-Angle-Attachment/dp/B000BYEJ02/ref=sr_1_1?s=hi&ie=UTF8&qid=1310084932&sr=1-1
-tk