reed bed grey water system

hey folks

i have dropped a 10' X 36' mobile home on the permaculture farm i'm starting and would love to build a small grey water treatment system.
I have a old, but well cleaned oil tank which i cut in half and want to use this...

each half measures 1600mm X 600mm X 600mm

There are lots of good youtube videos on how to make a GW system.  I like this one, because it looks nice and fits into the landscaping so no one needs to know -

My favorite on is described in the Beyond River Cottage TV series, but I don't have the link, I'll have to find it.

I haven't seen one made the way your doing it - in drums..... interesting.