RE: Do I need a rotary tool???
I know everyone builds ARF these days, but for real building, the 2 best power tools I own are the Dremel Moto Tool and the Dremel jig saw. I own 2 of the rotary tools. I keel a cut off wheel in 1 and a sanding drum in the other, a cordless.
You might want to pick up a couple of Roto-Zip bits. They work well in Dremels.