I dont personally but theres write ups all over...
I can tell you, to quick how to....get a 10 gal
and go to HD
and get a peice of glass cut as the divider....make sure you measure closey the inside width and heigth you want....if the tank is 12" tall....get the divider about 8" (there are a few ways to do this divider....Id research on it and see how you want it) and buy some glass silicon made for aquariums and glue it in there where you want it
I'll help and try to find some write ups on this that give better details and pics.
you should be able to make you own for about $50 (tank, return pump, overflow and pumping)