Hi MW,
I don't think a rattle gun would be any good with the drill end ,7000 rpm is a little fast and the impact action
would probably break drill bits Mf. The air ratchet works good as a drill though ,it's handy getting into tight spots
like under car dashes etc.
Well; it's one of those things that 'can be done, but shouldn't be!' WRT 'good workshop practice', that is...
I have used a rattle gun and 90deg gearbox, to drill a set of mounting bolt holes in an FJ45 Tojo Landcruiser's chassis rails, to fit a later model spare wheel carrier.
It was pretty rough on the drill bit's cutting edges, but that was the only way to 'get 'er done'.