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at 66mm, a 47mm CPU cooler will rub up against its sidepanel; which will make these coolers noisy, & decrease cooling performance, because a 3-4 mm airgap is required.320mm X 296mm X 69mm is the correct dimension, to get to 6.5 L, and fit a Flex power unit, as the OP wanted.unfortunately, the OP cannot get to under 6.0 L, unless someone wants to give him their prototype.no one on this forum is offering a final production model, under 6.5 L, and above i've explained why.
at 66mm, a 47mm CPU cooler will rub up against its sidepanel; which will make these coolers noisy, & decrease cooling performance, because a 3-4 mm airgap is required.
320mm X 296mm X 69mm is the correct dimension, to get to 6.5 L, and fit a Flex power unit, as the OP wanted.
unfortunately, the OP cannot get to under 6.0 L, unless someone wants to give him their prototype.
no one on this forum is offering a final production model, under 6.5 L, and above i've explained why.