Following up for anyone else who's interested in doing this - here's what I did to "clean up the look" a bit.
First, I pushed the cord for the seat connector under the rug - there's a groove there and it fits pretty easily.
Next, I got a couple grommets to fill the glaring holes in the chassis. I used a SoftSeal SS-0181 plug (1/2 in) and it fit good in the front elongated gap, but I had to trim it to fit in the back hole. I ordered a few extra and stuck them in some of the screw holes - they don't really fit there but good as any place to keep.
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To cover the gap - I ordered the WeatherTech Trim to Fit mats -
Trim-to-Fit Semi-Universal Car Floor Mat | WeatherTech .
I then trimmed the back strip mat as such:
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After trimming - the two sides fit pretty well front/back and made a fairly seamless look (for now.)
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This worked out well since I already had the factory water liners - the weathertech trim to fit was a good enough match for now (until someone finds/makes something better.)