Have you considered what orientation you will park the scope at?
If you park it horizontally, facing East/West, you can raise the height of the pier/pad by the difference in a N/S park where the scope pokes up at the SCP.
You should get a few more degrees 'downwards' that way...
I designed my walls to allow my scope, on an EQ8, to get down to 15 degrees with 2m walls. Just built the concrete pad up appropriately.
I currently have a dome on top, but allowed for the possibility of making it a ROR.
Neville
LSO
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