??? sump design!!!! NEW DESIGN ADDED!!

[The Grizz]

I have just bought a new tank and have to build a stand for it but I also want to build my own sump. So my question is this:

Where should the skimmers ( as in two t1000 ) be placed? Before or after the refugium?

I am planning a 44 1/2" x 21 1/2" x 16" sump with 4 compartments, this allows me to remove the sump from under the stand at any point. 1st compartment is the intake with LR rubble, 2nd compartment would be the refugium (from what I have read so far) with a DSB ( not sure if this is needed) and what ever else goes in there, 3rd compartment would be my skimmers with a bubble trap leading into the return compartment. There will also be 2 TLF Phosban 150's in the 1st compartment.

Would like to have some idea if I am going about it the right way and if there are any more thing's i should consider before I order my glass.

Also what kind of light do I need for the refugium? Where should heater be placed?

BTW the tank is 96" L x 22" W x 18" D

Here is what am thinking about building: