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One thing to consider also is wind. If your walls are too low or the pier too high your scope can be affected by wind.
If you don't get wind where the observatory is - great. But if you do then having the end of the scope below the wall is an advantage when its windy short of getting a dome.
My dark site can be windy at times and its cost me imaging time. An FSQ 106 laughs at this as it ends up being well below the walls and is not affected by wind.
But years ago a closed tube RCOS 12.5 inch ended up being in the back of my car too often as winds about 10kmh would wreck the images.
Also consider you may end up changing your chosen scope over time as a lot end up with longer focal length scopes as the desire to image galaxies takes hold.
So 2.55 metres should be quite high. I think both my observatories walls are about 2.3 metres. One never gets wind even when its howling the other does as its quite exposed.
Greg
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