[Meru (Michael)]

That is my main concern with this design, that if the concrete isnt damn near perfect level then it'd be a PITA to setup!! But now that you mention it that actually makes sense; any tilt back or forth will be taken into account by the latitude adjustment, any tilt sideways wont matter as it'll be along the axis for RA and you can adjust the rotation of the mount for finding the polar axis. Excellent