Huh, that gap looks a lot larger than the thickness of carpet. I thought maybe you had wrapped the carpet under the console but it doesn't look like it and that probably wouldn't account for that big a gap. I'm sure you didn't add carpet padding ( :LOL2: ).
Sounds like you screwed the ply down and then put the carpet down. Did you double the carpet around the edges (doesn't seem likely to create this gap even if you did). I can't imagine the gunnels flexed during the project, but the gap between the console side and hull does not seem uniform. I don't know. Perhaps the new ply is note seated fully against the floor framing under the console.
Sorry. This is just my not too helpful steam of consciousness.