Muz, thanks for your comments. I'm keen to pick your brain on a couple of things if you don't mind me giving you a call?
JD - the shed is 5m to the eave. I figured the additional height wouldn't add much extra cost in the scheme of things, and I love the feeling of space as I wander aimlessly around the frame, dreaming of it being finished and stocked full of cars and tools.
There has been a range of red machinery during the build so far, so I thought I'd move one more piece on site to give me a bit of a feel for the space - and what might go where.