I know someone who did this. He was forcefully removed from the hobby by an angry wife 10 years ago after it overflowed and caused about 25k in damage to their home.
IME KISS is king here. It's fine to have multiple tanks share a sump but not ok to cascade. Not only is it completely unnecessary, it increases potential for failure.
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Hobby Experience: 9200ish gallons, 26 skimmers, and a handful of Kent Scrapers.
Current Tank:
Vortech Powered 600G SPS Tank w/ 100gal frag tank & 100g Sump. RK2-RK10 Skimmer. ReefAngel. Radium 20k.
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