Plot Size vs. Storage
You would gain absolutely nothing. The storage for bases caps at 18 storage bins total.

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Furthermore, you can pack 18 storage items into the basic plot.
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Yeah, the Devs seem pretty set against increasing Storage limits, so your only solutions are to either start a second SG with base just for extra storage, or just start using up the salvage/enhancements/etc you already have.
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Thank you for the quick responses, guess we need to consider a 2nd base than.
Does anyone know how much storage you get with different size plots?
We are thinking of upgradeing to the largest plot size (currently 2nd largest plot) but what will that gain us in storage capabilities, we seem to be outgrowing our base when it comes to storage. Any help would be much appreciated.