| i'm a dys'er, so i don't remodel or build for a living, but here's my understanding. if i'm wrong i know the pros that frequent this site will correct the error.
cement board alone is fine in the shower area, then you can use green on the other walls in the bath or cbu here as well. you can put cbu over green if you want to but i'm not sure why you'd do this... somebody with more exp probably has a better opinion on this. if you use cbu i think you are supposed to put paper between the cbu and studs, or the green and the cbu if you put up both.
either way i'd use cbu and not greenboard alone in the shower area... i know you can use green in the shower area but why not use the more h20 resist cbu? especially if you're paying good $$ for tile... put up the better stuff.
as for the puddle, do you just have a shower curtain off a rod or a shower door set? I can tell you our public bath uses a shower curtain and a liner curtain (dunno what else to call it... goes on the inside of the tub, the other is at the outside)... doesn't matter. if you take a hot, steaming shower water condenses off the shower curtain and goes to floor.
are you saying the tub is not level?
the only thing i think could fix ours is a better bath fan (the one in there is JUNK) or a shower door set. i'm guessing we'll do both when i remodel this next year.
again, the guys who know better will have opinions on the puddle issue. | 
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