Well Its either going to be a 4-2-3-1, 4-1-3-2 or 3-2-3-2 setup isnt it?

4-2-3-1 as above... Or

-------ST-------
AML--AMC--AMR (Could be 3 AMC)
----------------
---DMC--DMC-- (Could be 2 MC)
DL--DC--DC--DR

4-1-3-2

----ST--ST----
AML--AMC--AMR (Could be 3 AMC)
----------------
------DMC------ (Could be MC)
DL--DC--DC--DR

3-2-3-2

----ST--ST----
AML--AMC--AMR (Could be 3 AMC)
----------------
--DMC----DMC--
DL----DC-----DR

----ST--ST-----
AML--AMC--AMR (Could be 3 AMC)
-----------------
DML--------DMR
---DC-DC-DC----