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Exchange 2007 SP3 RU 13, Moving FSMO roles to Windows 2012 R2 DC's and decommission Windows 2003 DC's.

My research suggests this is possible but I wanted to throw it out there for those that can confirm this in real world use scenarios.

I have Windows 2003 R2 SP2 DC's, 1 Windows 2008 R2 SP1 DC and 2 Windows 2012 R2 DC's.
The Domain Functional Level is Windows Server 2003.  
I am currently running Exchange 2007 SP3 RU13 on separate non-DC servers.

Before I upgrade Exchange from 2007 to Exchange 2013 I would like to move the FSMO roles from the Windows 2003 DC's over the Windows 2012 R2 DC's then decommission the Windows 2003 DC's keeping the Domain Functional Level at Windows Server 2003.
Does anyone see any issues with this so far? Should I move the FSMO roles over to the Windows 2008 DC instead?

Also if someone can confirm that these steps are best practice....
1. After the above is complete I will install Exchange 2013 onto a Windows 2012 R2 Server
2. Move everything over from Exchange 2007 to Exchange 2013
3. Decommission the last of the Windows 2003 servers that Exchange 2007 was running on.
4. Bump the Domain Functional Level up to Windows 2008 R2 SP1
5. Decommission the Windows 2008 R2 SP1 DC
5. Bump up the Domain Functional Level to Windows 2012 R2

Thank you in advance for your comments!
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Cliff Galiher
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preshomes

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I have already moved and configured DHCP to include the new DC's and I have already updated servers and devices with static addresses to point to the new DC's for DNS.

The Windows 2012 R2 DC is a Hyper-V VM where as the Windows 2008 R2 server is not.  The VM is currently setup comparable to the Windows 2008 although the processer is faster than the Window 2008 Server.  I just wasn't sure if there was a best practice.  I personally would like to move them directly to the Windows 2012 DC (VM).

Will S. - Have you worked much with a Windows 2012 DC that is also a VM?  I have disabled the Time Synchronization in Integration Services and assume after moving the FSMO roles and setting the PDC on this machine as the external time source that servers will start looking at this server now for the time versus the old decommissioned Win 2003 DC PDC?
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arnold - Understood...Thanks!
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Thank you everyone for your comments! It is appreciated.