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Peter, the above advice seems good.
I offset my pier so that my fork-mounted scope would be central - and that worked fine.
Then I upgraded to an equatorial mount with a much larger scope. The dome slit is probably on the narrow side, being just 700 mm in a 3.6 metre dome, and the pier is offset 250 mm North of centre. I was surprised how much off-centre the scope is especially when looking at objects close to the meridian. Objects close to the zenith require crazy dome positions, but I can always manage to get a 'full' view. Any larger aperture would not work!
So if there is a lesson in all of this, it would be to do some modelling first!
Good luck
Chris
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