Thanks Jeff, looks like yours would be a vote for 8mm. The plate is approx. 200mm width to keep the ring spacing at 165mm - though the mount will primarily be an EQ6, I use an older Vixen SPDX at times which fixes this figure.
I already have some 140mm x 6mm aluminium flat bar and it seems pretty stiff, hence my thoughts on using 6mm.
John
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