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As far as the height of your walls, you'll have to first work out your pier height (or tripod height if you go that way). Then place the scope on it, in every imaginable angle of the sky (being aware that some sky locations place the scope very low), then imagine a line (or use a string-line) thru the centre of the scope to about 15 degrees high in the sky (anything lower isn't worth looking at due to atmospherics).
Then measure how high your walls should be by finding the lowest point where the string-line crosses your proposed wall location.
This should give you an all-round view of the whole sky above 15 degrees.
But also remember that the rolled-away roof will block some of the sky, so orient the roll-off section in a section of the sky you won't want to look at much.
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