Request for help, Spanish

I'm currently working on Lun=EA (<Lun=E9s < Luna + -=E9s), the official
language of the Pan-Human Republic.  It is descended from a
Spanish-lexified creole, with substrate influence from English and
Esperanto (a language spoken in a number of Lunar colonies), and
probably other languages.  Now, the questions I have are these:

What is the distribution of the allophones [a] and [A] in Spanish?  And
do all dialects have those allophones?

What are the pronunciations of {ll} and {y} in different dialects?=20
Particularly in Mexican dialects.

One sound change involves the loss of intervocalic voiced stops.  Now,
in words like "ciudad", this would produce [sju'a] (I think, or is it
[sju'A]?).  What should I do with those kinds of words?  Ordinarily,
unstressed high vowels become glides when prevocalic, but *[sjwa] would
be impossible.  Would it be reasonable for that to become a rounded
glide, that is [s;ha]?  Or would it be reasonable for an epenthetic [w]
to be added, creating [sju'wa]?  Or should I just leave it at [sju'a]?=20
Or, might the [j] be vocalized, creating [si'wa]?

--=20
"No matter how much cats fight, there always seem to be plenty of
kittens" - Abraham Lincoln=20
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