Errrr, maybe I am looking at this wrong? I see a middle inlet, with the water going up, then spliting two ways and then down both sides of the middle and then routed into one outlet? Why not just one big channel in the middle with thre or 4 fins? The core is what you need to cool not the whole block. If you can successfully cool the core with a middle inlet then you need not worry about the rest.
Anyway if you totally disregard my thought, which is fine because I can be, have been, and will be totally wrong, then at least move the out let closer to the inlet so you have more room to seal and more room for the mounting hardware. No reason for the outlet to be so far back. Back just far enough for the water to merge effectively into one.
Good luck, looks like a "cool" project! Keep us posted.
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