I have pmed you. I can make you a media rack if you like. I also have some egg crate if you need some.
With the experience of my tank I would stack the media rack as follows:
- bottom section, coral rubble.
- mid section, purigen on bottom and carbon on top. You only need a small amount of carbon for 50ltrs of water and it should last 30 days.
- top section, sponge or filter wool.
If you load up the rack with too much media then you don't get very good water flow through it.
As for the purigen, after 30-40 days (or when it turns a creamy brown color) you can recharge it by soaking it in a 1 part bleach 3 parts water solution until it turns white again, rinse it until you can't smell the bleach anymore and then pop it back in the media rack.
I have seen there are different versions of this tank, one with the intake down the bottom and one with out. Mine didn't have this but I would seal it up because it isn't much use for a marine tank.