If you want to edit the updater-script (what shows up in recovery when you choose the .zip to flash. It it's in META-INF\com\google\android\updater-script, edit with notepad++, and edit in between the parentheses ui_print("Put Your Text Here");
add your .apk/.jar files to the appropriate directory within the zip.
for example, SystemUI.apk would go into system/priv-app
android.policy.jar would go into system/framework
No need to seek permission for this or give any credits. Just something for those who need it.