One of the most-used and most important tools you'll need when building an RV is a pneumatic drill.
Here are some tips regarding drills and drilling accessories:
1. Buy Sioux drills. Don't mess around with any other brand. These are simply the lightest, best ones available, and are a pleasure to use. Avery Tool sells them.
2. Buy TWO of them. Put a #40 bit in one, and a #30 in the other. Leave 'em that way. I made labels for mine (see first two photos) that identify which is which. Sounds silly, but you WILL grab the wrong one someday.
3. Buy lightweight air hoses and fittings (see first and third photos). The clear ones pictured here were from Avery Tool, and they're so light, you scarcely notice them. Add a swivel connector to the drill (first photo) and you'll be able to use it in lots of tight spots that other drills can't reach.
4. Set up a manifold with several air lines running to different parts of your shop (see third photo). That way, you won't have to drag air lines all over the place when you want to move from the fuselage to the workbench and back.