Hi,
I've used many MM system in my past tanks. You can see picture of it here: http://www.swt.edu/~xp42012/2002/

Currently, I'm running a Lifereef Sump & Skimmer & Deep Sand Bed on my 120. I'm wishing that I should've set it up as a Shallow Bottom/Bare Bottom & Caulerpa Sump.

If you are not going w/ MM, then go w/ a complete custom system from Lifereef. When you order a custom system, everything work together, so you there less plumbing headache in your part. Lifereef skimmer is not the MOST powerful skimmer, but they are less maintenance and quieter then the other powerhouse. Lifereef is jacking up the price on their system in severeal months. So, order now. There's a long line to get your stuff custom build from Lifereef, so plan that in.