CBT-that's what I built. click on the link. you can run it as a single hive or install the dividers & run it as 3 hives. it is sized so that 2nd deeps or honey supers will fit.
aside from being on legs so you do not have to bend over I see no real upside to these. the guy I built this one for jumps on anything he considers new. he has a lot of idle gadgets gathering dust, including 3 flow hives.