Strange phonology

I'd like to know your opinion on some sounds
I intend to have in a new language.

1) Have you ever heard of an aspirated trill?
I'm sure I've seen it somewhere, represented as
<rh>, which would be /r/ with a simultaneous
aspiration. I mean, it looks possible, but I don't
know if it exists anywhere and if it could contrast
with a non-aspirated trill /r/.

2) I want to have a retroflex (or maybe post-alveolar)
"s", contrasting with a normal alveolar /s/. Is this
reasonable? Is this retroflex "s" the one present
in Sanskrit, which is transliterated as "s" with a
dot below?

3) Is it reasonable to have an aspiration contrast
for nasals?

4) I just produced a sound more or less like the
one a child might produce when he sticks out the
tip of his tongue between his teeth, and blows.
I found in this way you can produce a trill
(makes your lower lip shake) or an approximant
(air going between the tongue and the lower lip),
though I don't know if they exist in any language,
or how to call them. What do you think?


Thank you all in advance.


--Pablo Flores

* * * * * * * * * * * * * * * * * * * * * * * * * * *
 And the Lord said unto Job, "There's no
 reason for it.  It's just policy."
                                       Kelvin Throop