Moving CUCM Cluster from 7.1.5 to 10.5 and migrating P2V

Community - What I am looking for is advice from those who have actually done it!   Reading about sex and having sex are two different subjects. I am finding relevant docs on the CISCO site, some are contradictory.  One doc on CISCO Prime Deployment says yes to CUCM 7.1.5 and another says no.  We know the standard "refresh" upgrade process, cop files and that entire drill.   What we are looking for is comments from those who have done it before!   Our Cluster is mixed MCS servers with CUCM PUB and SUB at Version 7.1.5. Unity/UCCX at 8.0.2  with no HA (don't ask).  We want to end up with BE6000 and have UCCX in HA mode on Version 10.5 (10.6)!  So what do you think, Migrate all in cluster to a common base like 9, then migrate to VM and upgrade?   Or try to do it some other way.
All Comments welcome and very appreciated! 

@Jamie I think we eliminated PCD as a strategy.   We see this as following the usual upgrade process and assume we will be taking multiple steps.  Step one would be to get all on a common version and we are thinking  8.5.   At that point we could do the P2V and then upgrade to 10.5 on ESXi.  We need to create some HA for Unity and UCCX, but will do that after we get to 10.5.  Hopefully we can upgrade the CUCM Publisher, during which time the rest of the cluster will be operational?  Put Pub back online as 8.5 and then do the subscriber.  Again, we think UCCX and Unity will be operational on PUB as we upgrade SUB.   Once on CUCM 8.5 we will then schedule maintenace windows to upgrade Unity and UCCX.   At that point we have a cluster on 8.5 ready for P2V.  We do that migration and when all are on ESXi, we do the upgrade to 10.5 and add in a HA server for UCCX and Unity.  How does that sound?   As we really dont want phones rebooting and downloading firmware, we will do that ahead of time, but are researching the level we should get them to before the 8.5 upgrade.
@Amn thanks for the link.  We have been reading all we can on the CISCO site, and are really seeking out those who have done this and can share experience. 
Thanks to all who comment.

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