Since you are on Oracle 11 one option would be duplicate from active primary. You can use the Standby parameters of DB_FILE_NAME_CONVERT and LOG_FILE_NAME_CONVERT for the directory structure.
duplicate target database for standby from active database NOFILENAMECHECK;
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I don't think you are doing a normal RMAN duplicate database either using "active database" method or with the traditional duplicate method.
If you are going for a normal restore and then perform the recovery, then
1. Hope your standby instance is in nomount state.
2. restore the standby controlfile (hope you have taken the controlfile backup of primary as a standby controfile).
3. Mount the standby instance, and catalog the backup pieces placed at "/u05" mount point.
4. Restore the database
5. start the recovery.
Hope these steps are clear.