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Hmm, well are you planning on imaging? Most experienced imagers avoid starting up on any object below 40 degrees, for the usual reasons: thick atmo to shoot through, more light scatter from towns, street lights, etc.
Secondly, mount height may not always be the same, as you may buy a different mount, etc. Consider whether your using a tradition mount cage on top of the pier. Will you be using any sort of riser dovetail setup etc. Many factors affect the height of your scope.
I tend to favour having the equipment sitting down inside the walls, as it seems to create a stable environment and discourage dew and whatever wind maybe around to push on a scope.
Just a few thoughts based on my experience.
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