Maybe these threads will help you. I still dont understand what's so hard about making an assassin but people keep asking about it.
http://www.gamesas.com/index.php?/topic/1304966-stealthassassin-build/page__hl__assassin+build
http://www.gamesas.com/index.php?/topic/1304528-assassin-build-help/page__p__19629625__hl__assassin+build__fromsearch__1#entry19629625
http://www.gamesas.com/index.php?/topic/1300939-a-few-questions-about-my-assassin/page__p__19586346__hl__assassin+build__fromsearch__1#entry19586346
http://www.gamesas.com/index.php?/topic/1298930-assassin-build/page__p__19576531__hl__assassin+build__fromsearch__1#entry19576531
http://www.gamesas.com/index.php?/topic/1296710-assassin-character-build-help/page__p__19531573__hl__assassin+build__fromsearch__1#entry19531573
http://www.gamesas.com/index.php?/topic/1296493-assassins/page__p__19527352__hl__assassin+build__fromsearch__1#entry19527352
http://www.gamesas.com/index.php?/topic/1293670-a-few-questions-about-my-assassin-character/page__p__19494324__hl__assassin+build__fromsearch__1#entry19494324