It was a diy sump and that old set up was horrible. It worked for minute but the sump was to small and there was no room for a refugium so I had to go with a hang on back refugium. The tank is okay not drilled just using an overflow box. Don't drill it to risky. I didn't cut the floor just the middle shelf with a dremmil. I ended up going with a whole different stand and sump after the last earth quake we had here in cali I didn't trust the integrity of the stand after I altered it. I suggest you buy a stand that's much bigger in order to house your equipment. I went with a stand big enough to support a 100 gal and I still wish I would have gone bigger.
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