I plan to build "steps" using eggcrate and have the powerhead and heater under there.
The skimmer will sit in the corner (elevated) and the steps will be built around it.
Tank Dimensions:
600X300X500
Filtration:
my trusty old TS1 Skimmer
HOB filter running seagel and floss
Flow:
Hydor Koralia 4 (if it aint strong enough, I have a sunsun 12000LPH)
Heating:
100W no name heater
Lighting:
Still unsure, thinking either T5's or CFL's
Some pics:

Hydor and heater

TS1 :gunsmilie:

Thats all for now :downdown: