Originally the splash guards had an angled bottom that funneled the coolant and chips back into the plinth and down into the coolant tank. Since this section didn't extend all the way to the front, I had a gap with the new curtain enclosure. So I removed those pieces too and made up some side trays to catch all the coolant and chips and angled it to the front to make chip scooping easier.
Now that everything was nice and square, the curtains hung down inside the trays and the chips were contained to the machine. Since this was just a quick test and not really made to be permanent, I just drilled a 3/16" hole in the corner of the tray to let the coolant drain out into some buckets.
I'll add a proper fitting and some tubes to drain it right back into the 'new' coolant tank that I'll be fabricating later.