I am trying to figure out the best way to model this:

it has top and side rails that bow in the center. When I tried free form box modeling I got very goofy results. I am trying it now with patch modeling. Any advice would be appreciated.
Thanks

it has top and side rails that bow in the center. When I tried free form box modeling I got very goofy results. I am trying it now with patch modeling. Any advice would be appreciated.
Thanks
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