Also, it isn't really a build, but there is one trick I've used to help keep my characters alive.
One of the more "modern" game mechanics that Morrowind lacks is health that regenerates constantly. However, this functionality can be added, without cheating or mods, simply by wearing an item enchanted with a constant effect restore health effect. I'm not sure if such an item already exists in game, as I've always made mine and making them isn't too hard.
I usually use a shirt or pants, since my armor and weapons are often carrying other enchantments instead. You'll need one of the higher priced clothing items, either exquisite or extravagant if I remember right. You'll also need a powerful soul, which you can get through normal gameplay or by using a summoning item or scroll. This also means you'll need a soul gem capable of holding that soul.
Once you have a charged soul gem with a powerful enough soul, use the gem to create an enchanted item. If you enchant the new item with constant effect, restore health 1 to 1, you'll constantly regenerate small amounts of health while wearing it, which I think ends up being 1 hit point per second. That's hardly overpowered as you'll still have to use normal healing methods during combat, and strong opponents will still take strategy and skill. But what it does help eliminate is what I refer to as "immersion deaths" - where you die because you were too busy paying attention to the ambiance of the game and not the very low red bar in the corner of your screen.
Note that this tip is overly simplified for a reason, as I am trying to keep it ambiguous and spoiler-free, while still pointing out that such an option exists.