I don't think this has been done yet.  A Tenchi & Sailor Moon fusion.

Sasami	as Sailor Moon
Ayeka	as Sailor Jupiter
Washuu	as Sailor Mercury
Ryoka	as Sailor Mars
Mihoshi	as Sailor Venus

And of course...

Tenchi	as Tuxedo Mask

I see two problems.  First, since this would naturally lend itself to a
parody, I would end up using much the same jokes as BSSR, and I dislike
fics that have no originality.  Second, there's already a Tenchi magical
girl parody, Pretty Sammy.

Oh yeah.  I also don't know Sailor Moon very well.  ^_^

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And also, a Lovely Angels & Tenchi fusion.

Mihoshi & Kiyone

I don't think I'll elaborate.