I've always created work in A3 and reduced it down to A4/A5, as it allows me room to breathe and covers a multitude of sins, but after years of scanning in portions and piecing it together on Photoshop like some torturous jigsaw, I finally gave in and invested in an A3 scanner. It's a beautiful beast of a machine.
To test it out I rooted around for some A3 artwork I never got round to scanning and found this piece about explorers. Enjoy...