I WAS trying to model this after the alcasthq Magicka Templar build, however, I am so far not very impressed. However, I am new to ESO (3 months) and have not even reached lvl 50 yet. I feel like I need to at least get to 50, and with my accounts CP at 232, play for a bit with the Magplar from the alcasthq and see if this gets better. So far its not looking too good. Sustain is EXTREMELY low and healing myself takes too much magicka. I result to heal only if the monster is about to kill me and his life is more than 25% full. otherwise I use potions for healing.
Here is the build I am referencing:
https://alcasthq.com/eso-magicka-templar-build-pvp1/

I think once I decide for good this is a crap build, I will be resetting my skill points and going for more of a tank.