12.1.1 EBS for ASCP/APS/VCP clarification on app-tier platform change applied patches

Hi,
Here is the current state of our production ASCP/APS/VCP/Demantra envoronment :
Database Tier : HP-UX Itanium 64-bit 11.31
RDBMS : 11.1.0.7 (standalone)

EBS Application Tier : HP-UX Itanium 64-bit 11.31
E-Business Suite : 12.1.1

Demantra Application Tier : RHEL4 32-bit (Update 9)

We run planning/collections against our main ERP (where we run Oracle Financials, Warehouse Management, HRMS, etc. etc.).
Here are those details for that production environment :
Database Tier : HP-UX Itanium 64-bit 11.31
RDBMS : 11.1.0.7 (RAC)

EBS Application Tier : RHEL4 32-bit (Update 9)
E-Business Suite : 12.1.1
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Finally, to the point : We are in the progress of an upgrade (11gR1 => 11gR2) + migration (HP-UX Itanium => Linux) initiative wherein the future state is as follows: