New Sump plans

[golgi aparatus]

Hello. I need some help here. I am upgrading my 55g reef to a 75 gallon reef and need some help in regards to my wet-dry/ sump design. I know that I must either get a new wet/dry or design a sump for this new tank.
I currently have a wet/dry with bio-balls. I know that there is some disagreement on wheter or not to use bio-balls these days. If I decide to loose the wet/dry system and move in the direction of building my own sump, is there any place that I can get some rough plans online to do so?
I'm just not sure exaclty how to partition it all with the baffles and the drip tray etc...
I would appreciate the ability to look at some pics and descriptions of sump designs. Any help would be greatly appreciated.
The 75 gallon is of normal dimensions: 48"x18x21"
What size sump do I need as well?

 

[wattsupdoc]

A 20l would probably sufice, but a 30 would be perfect.

 

[netimreefer]

I am going from a 55 to a 90 gallon and going through the same struggle, but I think I have something that might help.
http://www.youtube.com/watch?v=CxnugJGiT3o
I have gotten good feedback from quite a few people, oh yeah and there is a second part to this, good luck let me know if I can help in any other way.

 

[natclanwy]

Here is a diagram of my sump design using a 30g tank. My skimmer is mounted externally but could be installed in the far right compartment with a little modification. Let me know if you want specific measurements.