Used Krusader and Odin_3_ROM_Editor to:
Add the SU binary to system.img in /system/bin
Add the Superuser.apk to system.img in /system/app
Add busybox to the system.img in /system/app
Followed the instructions in the Odin_3_ROM_Editor thread to repack supplying the proper partition size.
Flashed using Odin 3.09
Completes flashing in Odin successfully,
The SM-T235 boots up to the animated Samsung logo and that's as far as it gets. never really hangs, but the animation continues endlessly.
After reflashing with the factory NE8 image, the device fails to connect to the mobile network. WiFi connectivity seems to work fine.
EDIT: After second restart Mobile network working fine on factory non-root image again.
Any idea why the device sits at the Samsung animation logo after flashing the rooted factory image.