For anyone reviewing this thread, or who has a problem with water pooling into the floor of the Saturn Vue, I found that the round plastic caps in the unibody below the A pillar weren't sealing completely.

To resolve this, I needed to remove the plastic fenders clean, rust-repair and reseal the body plugs back in. Problem solved!

Also, in our '03 Vue plus as I've found in other Vues at a few salvage yards, the cast aluminum base for the center/shifter console corrodes where it contacts the floor. This is probably due to constantly wet carpet and underpad plus likely the dissimilar metals (floor is steel, base is aluminum.) The softer aluminum gives up first and the legs are eaten right out.

It's been a few months since I removed the interior seats, console, trim and carpets, plus the exterior fenders and door cladding to address (scrape/wire-brush/treat/POR-15) the rust prone areas (no perforation for me, just surface rust) and the ingress of water has stopped now, completely. Yay!

 

Appreciate the update.
Few people take the time to share the solution / findings for their posts unless it's within 2 days,

You're always welcome here--don't have to have a problem to post....