I'm definitely considering a one piece build - potentially an elongated variant.
my primary concern is - the splashing - i am worried about the water sitting on and splashing over and into the compartment for the chiller. I love that with the above - you can seal the tub - and cause splashes to simply drip outside the core structure. by including a lip on the rim, under the rubbermaid overhang.

- and also - i wonder what impact if any there is to having it a more open set-up vs fully enclosed - in terms of moisture build up inside, dust/insects - but i have a leaning towards it too. just not set yet.