Use 5/8 inch mdf, layer of non hardening glue, 3/8 hdf, layer of non hardening glue, and 5/8 plywood to support them. Near perfect without the cost. Perhaps put the hdf 1st. Toss up. Enjoy. You have 98-99% at reasonable cost. If you’re obsessive switch the 5/8 mdf for 5/8 + of granite for your baffle. Your there with the big boys at minimal cost.