Well this is my 1st post on this site although I have been lurking around for a while now.  I have had a saltwater tank for 15yrs which i have really enjoyed but never really went over the top with it.  Now is the time!
I am staring to put together a room divider between my family room and kitchen which will be a 120 gallon reef tank.  I will be custom building the stand and having a tank built with eurobracing.  I will be building the sump and ref. myself with lots of questions from you guys
Here is a pic of my current tank:
Here is where the tank is going to go:
Its going where the xmas tree is so it won't be going into place till after the season.
Couple of questions for you:
1)  my current tank is 75 gallonish.  the one i am thinking about building is 48 x 24 x24.  Being that i am building it I could very the size.  Should I look at building a different size?  and if so why?
2)  Going to have an external overflow mounted on one end as three side will be visable.  How many holes should I put in the bottom of it and what size?
3)  what size of sump/ref  should I build?  how many sections?  and what goes where ( I am a total NOOB when it comes to sumps)
4)  plumbing?  out of the overflow what goes where?
I may want to expand with equipment so I want to do this right the 1st time.
I thank you all in advance and sorry if these seam like simple/stupid questions but I am trying to peice this all together.
Jeff