You might check the archives of this ng at google for more information
on elderberry wine. IIRC Ben Rotter has a little bit of information
on elderberry wine on his site called 'Improved Winemaking' (i think).
Honestly there's not realy much other than recipes out there about
elderberry. That said I would make each wine your considering
separtely and blend before bottling. You have more control this way.
Also, It seems to my limited experience that Zin is a wide range of
wine depending on viticulture and terrior.
When I open a bottle of elderberry I think merlot. Definately can
stand on it's own merits.
This year I have 2 batches, one is just elderberry with American oak
the other with raisins, banana's and a handful of Oregon Grape and
French oak. We'll see what happens in a year or two.