My dual fan setup is very similar to your sketch. I am using 12" SPAL fans with the big motors so they are pretty heavy as well. I used .063 aluminum.
I realize you are setting up yours as pushers while mine are pullers but I suspect the mounting / load issues are similar. I have no idea what your core support is like so the rest of this might be of no use to you. I used 3 screws on each side (down the core support), 1 on the bottom in the center and 3 across the top. On the top I incorporated a stiffener which bolts to the core support on the sides.
I realize you are setting up yours as pushers while mine are pullers but I suspect the mounting / load issues are similar. I have no idea what your core support is like so the rest of this might be of no use to you. I used 3 screws on each side (down the core support), 1 on the bottom in the center and 3 across the top. On the top I incorporated a stiffener which bolts to the core support on the sides.
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