Dark harvest shaco doesnt even need duskblade.
In fact, I'm pretty sure hes better off without it in higher tiers when adc all have tabi, bt, ga and even randuins omen cancer defenses with their whole team help and shields. Its better to build like a bruiser and just get the extra scaling burst for late game from dark harvest.
So choose one of these pairs
or 
then choose one of these
choose one of these
. Your other items are your tiamet that goes to
or
and a
or
.
Situationally you have to get this
instead or the last defensive item because an enemy ad carry will have too much life steal in the last game that it can just face tank you and your clone if you don't have it, but it doesn't always have to be your job to dive and kill an ad carry either though so its situational.