drain hole configurations?

[Kracker Jack]

I don't know if I'm saying this in the correct terms. But I'm not putting back the actually free floating type splash well. I'm keeping my transom open except for the 3 walled splash box I'm building off the floor around my sump well the height of the 25" inch sides of my transom. Sorry if I'm using the wrong terms. Did yall actually put 2 drain plugs down in the sunken box in the floor? I'm also putting a bulge pump in this recessed hole also to pump out deck water. Do I need to build this 3 sided raised box off the floor? I'm kinda second guessing my original design now. I mean they had to have drain holes in these recessed wells to drain while on land or trailer.