To be honest with you man, modding out that sump would be more work then just buying a new/used tank and putting in baffles. I will bet you will switch that sump out in the first 6-12 months of your tank running for a different sump because that will not do anymore.
Skimmer section should be the same as your return for a few reasons. 1. The changing water level with evap unless you plan on using an ato. 2. Micro bubbles that will end up in your display via return pump.
If you're still set on go for it, make your skimmer section as big as the internal skimmer you plan on buying
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