I'm glad to see other people posting about their transmission endeavors.
I have to say that my E4OD was the first I had ever done and I would be willing to do another.
As far as pieces and parts, it all depends on where you are headed power wise, there is no reason for billet shafts, drums & supports for 99%. you just need good quality frictions and steels and the factory upgrades and a good valve body.