Hi Ravi,
Since you are at much lower version you might be missing many changes which happened in 1099 and 1042 after 4.7 version.
All the structural changes that you need are in series of SAP notes since they were made one after the another. Please read Note 2117915 and check perquisites section. go to the notes mentioned as pre requisites and check pre-requisites for those notes. Follow this same process until you reach note for Version 4.7 . Once you have backtracked till there apply all those notes in sequence.
Also have look at note 2095167, this Note provides a custom program by SAP which can do lots of structural changes required for 1042 automatically, but be careful with this program. Since this program automatically changes lots of structures and those structures are standard structures if any undesired change is performed reverting it back can be a headache. fortunately this program has a test mode.
All the structural changes are manual changes. I personally feel manually making changes in better than the program.
Thanks, Parag