ICS/JB/EXT4 Unpacker - How to edit and recompile the unpacked files?

I have a Huawei Y536A1 US version. I am attempting to port the Y536A1 Canada Rogers version as it appears to have no carrier apps within it. I installed Cygwin and dsixda' Android Kitchen but the optiuon to extract the system.img file (ext4) does not work. I found the post for installing perl, split_update, ext4 unpacker exe, and huawei finder. Following the steps, I can unpack the system.img and extract the build.prop file. However I am totally lost at how to either edit the Canadian build.prop or how to replace it with the US version. It is simple enough to replace any .img file within the output folder, but I can't figure out how to replace or edit files inside the .img files once they are unpacked into the EXT4 unpacker. Any help would be greatly appreciated. Also, if I am going about this incorrectly, any info on redirecting my efforts to be used with a different tool would also be appreciated.

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