> Does this sound right to people, or should i write Nikki in the
> Quenya mode with the tehtar on the preceeding consonant?
It's more common to write English with the tehtar on the following
consonant. However, in this particular case, I think you could write
it either way without problems. J. R. R. Tolkien has used both
tengwar-tehtar orders for English. The advantage of placing the tehtar
on the preceding consonants, is that both consonants will carry a tehta.
But what is more important and should always be considered when
pondering which tengwar-tehtar order to use for writing a name, is
that neither way of writing it will cause misreadings. When placing
the tehtar on the following consonants, then there's absolutely no
risk of misreading because of the required short carrier -- and when
placing the tehtar on the preceding consonants, then you could
theoretically misread the name as Inikk/Inick (iNick?), but I'd say
it's pretty obvious that this is certainly not it, but Nikki.
And make sure you're using the letter quesse for k, not calma.