Looks good. You put a lot of detail into it. What brand chromo's did you go with and what size tire do you expect to eventually run? My guess is depending on how you run it, they will last pretty good but be sure to realize they aren't bulletproof. Ask me how I know.
Re a drain in the rear dif, if you run rocks, you will find that you will hit the bottom 3 nut/studs and they will bend, causing leaks. I pulled my 3rd member and welded a nut onto the inside of the housing. Now, the heads of the bolts get scuffed but don't bend and break the studs. In addition, when you pull the bottom bolt, it doubles as a drain.