[lojban-beginners] Using "nu"

[Ben Foppa <eatingstaples@gmail.com>]

What exactly are the rules of "nu"? I'm (with my beginner Lojban
knowledge) trying to translate "Lucid dreams are beautiful" into
Lojban for a forum signature, and this is what I came up with:

melbi fa lonu lo senva cu sanji le sevzi

Aiming for "Self-aware dreams are beautiful", or, more precisely:
"beautiful are dreams which are aware of the self".

Thus, my questions are:

1. Is this correct? I'm a little confused as to how to turn "lo senva
cu sanji le sevzi" into a sumti.

2. I'm thinking that not using "fa" (i.e. "lonu lo senva cu sanji le
sevzi cu melbi") wouldn't work, because it's sort of vague as to what
the "nu" encompasses. Is this correct?

3. Is my use of "lo" twice correct? How would meanings change if I
used:
    -"le" and then "lo" (would it imply that we're talking about
specific instances when any lucid dreams occurred?)
    -"lo" and then "le" (would it imply that we're talking about any
instances when specific lucid dreams occurred?)
    -"le" twice (would it imply that we're talking about specific
instances where specific lucid dreams occurred?)

I realize that's quite a few questions, and I appreciate any partial
feedback or responses, as well as answers to all of them.

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