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How to upgrade Domain - 2003 to 2012 R2 - task sequence

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Could someone please sanity check this task sequence?  I need to upgrade a 2003 domain to 2012 R2 and would appreciate a second set of eyes.  thx.

Goal:

1. standup two new 2012 R2 DCs

2. decomm three old DCs

3. raise DFL/FFL to 2012 R2

Current DFL/FFL = 2003 (one site, one domain, 3 DCs, 400 users)

3 Existing DCs (all to be decommed):

  OldDC1 = Svr2003 Std Ed SP2 x64 (holds all FSMO roles, GC=yes)
  OldDC2 = Svr2003 Ent Ed SP1 x86 (holds no FSMO roles, GC=yes)
  OldDC3 = Svr2003 Std Ed SP2 x64 (holds no FSMO roles, GC=no)

New DCs to be added:

  NewDC1 Svr2012 R2
  NewDC2 Svr2012 R2

Proposed task Sequence:

* build and patch OS, then add ADDS role to NewDC1 and NewDC2 (do not yet add servers to existing domain)

* in the network config of new DCs, set the DNS server IP to the IP of OldDC1

* when installing ADDS, I will be prompted to run Adprep.exe - it will be run as part of installing ADDS - this will update existing domain schema as needed.

* add NewDC1 and NewDC2 to existing domain

* in the network config of the new DCs, set the DNS server IP to that of the local server

* make both GCs, make both DNS servers

* distribute FSMO roles thusly:

* DC1 = PDCE, RID (more frequently used roles)

* DC2 = SM, DNM, IM (rarely used roles)

* run dcdiag.exe commands to verify functionality

* power off OldDCs one at a time, waiting 24 hours between each shut down

* raise DFL/FFL to 2012 R2 after all old DCs are decommed



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