I get the impression that you want it as simple as possible.
It is possible to have a tank that is not drilled and without a
sump, however it will be hard to hide away tech equipment.
One way to do it is to use the filterbox in the corner in the image earlier in the thred. Simply place it in the corner and use it as a holding place for the
skimmer, it can be modified in a way so it only takes in the surface water from the tank so the
skimmer will be more effective (see image).
Another way is to get a hang-on
skimmer, like Deltec MCE600, its the easiest way. Simply hang on the side of the tank.
For circulation i recommend the Koralia streamers two of size 3 would be a good choice, there are many manufacturers of streamers out there so what you choose for this is not so importart, as long as they give a widespread and sufficient flow (atlest 10 times the size of the aqarium, ex 400 liter aquarium = 400x10 = 4000 liter/h).
With a tank like yours i would go with the following for a start. And see how it works.
1.
RO/DI filter to get clean water for the tank from start.
2.
Skimmer Deltec MCE 600
3. Good grade salt
4. About 40 kilos of
LR to start with, (maybe half dead or cured and the other half high qality)
Startup:
1. Fill up the tank to 2/3 with
RO/DI water.
2. Add salt to a proper mix with
salinity about 1.025, and turn on atleast one stremer. (and a heater if needed it should hold about 25-28 degrees C.
3. Add the liverock after about a day when the salt is well mixed, and do some initial aquascaping.
4. Add water so its almost full (to give room for sand if you wat to have that), premixed i a large bucket of somekind (plastic).
5. Turn on the
skimmer
6. Do the aquascaping til really satisfied, there is always room for redoing it later.
7. Add sand, preferably livesand, about 2-3 centimeters.
8. Let the tank cycle for atleast 4 weeks, with lights off.
The sand is added after the
LR cos you will propably end up with som digging critters, and everyone knows what happens to a stone sits on top of sand that is beeing removed.
Lighting and other stuff is a issue that can be dealt with while the tank cyckles.
While the tank cycles I would think abot what kind of tank I'd want, mixed reef,
FOWLR, SPS tank ...
This is how I would do, it does not mean that this is the only way.
I have seen a book called "Saltwateraquaria for dummies" or something like that, have not read it but i think it's a step by step guide how to setup a tank.