Given those dimensions I'd use a 1.5mm thick base-plate if you had the central inlet jet like the White Water, and 2.0mm without the jet.
Hey, it's fine if you want to copy the White Water for yourself. I've never had any problem with anyone doing that. All the better for people to enjoy doing something themselves if they're into that sort of thing, and have a decent performing block at the end of the day.
Dimples? Sorry, can't say I've read the whole thread through yet. I'll take a look and get back to you.
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