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If you want to close the roof with any scope orientation, then with a skillion roof (I had to google that, means flat ;-) will need high sides and possibly restrict viewing near the horison. A gabled roof allows lower sides, but still quite high ends. I found a gabled roof needs some tricky internal bracing high up to avoid the scope on closing, to stop sag.
It all depends on the OBs size (the bigger it is, the futher away the sides are), how low you want to image, and wether you can park the scope flat before closeing.
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