Yeah basically just a doubled up litter dam with the track on top. The grooves of the track are perfectly flush with the top level of the litter dam. I couldn't be happier with how it turned out. Did it for no extra cost, but be prepared to wait an extra two and a half months for that modification hahahah!
I'm sure it stands the risk of being pooped/peed in but it's no more of a risk of that happening than with the regular door tracks.
If I ever order another cage with a shelf I'm going to see if they can cut the LED groove at the front of the cage. I just drilled a hole for my new lights through the side vents and then put them along the top edge of the cage on the sides and front. Soooooo much more adequately lighted for cleaning and stuff now
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