2. This might not be exact enough for you .. but ... I I Inset all faces. Alt P Poke all faces. Ctrl Shift B Bevel all new vertices. I Inset new faces, E S 3 times for holding edges top and bottom of holes, and bottom face of holes. I for internal holding edge on bottom face of holes. Ctrl 2 on the keyboard to put on a couple of levels of ...
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