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So I bought a pair of plate amps and a pair of 3" precision ports this last weekend to go with those GRS 12" high excursion drivers.
I'll post preliminary models later since I won't have actual enclosure volume until I get bracing figured out. I suspect it will be around 2.6 cubes or so.
Today I cut all six major panels and mapped out the front baffles. They will be mirrored. The front port is a concession to placement, so don't give me any shit.
Overall outside dimensions are about 16x17.625x17.625. front and rear baffles are 3/4 MDF. Rest are 5/8" particle board. I used what I had.
Will cut driver, port, and amp openings tomorrow. Mock things up and plan my bracing accordingly.