spumoni stout... possible?

I may be a bit ambitious with this brew, but since having Saugatuck brewery's neapolitan stout, I've wanted to make one myself. However after thinking about it, I figured I'd try being completely original (Google search for a recipe yielded nothing). Anyhow, I guess I'm at a loss as to amounts of cherries and pistachios. Also, since this is going to be an experimental batch, should I go the route of a 1 gallon batch to test it out? Thanks in advance!