Three pictures for your consideration:
Two 2 drawer units stacked

Two multi-drawer units stacked

Multi unit on top of two drawer for a breakfront effect (I hope)

The first one looks OK to me. I could stick some extra feet on the bottom for a little more height
The second one looks too skinny to me. And I'm not sure I need 4 small drawers in one place.
I quite like the last picture, but that one screams 1/4 scale to me.
What do you think?