This is fantastic and I'll be giving a try. Do you think the recipe/process works fine if I scale it down to a 1-cup yield?
I honestly couldn't say, I've only made the batch listed in the link. It tends to keep pretty well, so I usually just make a jug of it and use it over the course of a few weeks. The cleanup can be a little cumbersome, so I'd rather do it in bulk and spend less time on the cleanup.
If it settles, do you get a consistent texture when drinking it? Ever tried to foam it for a latte?
The hardest part is figuring out just how long you need to blend it for. It took me three batches to get it just right. The first was too thin (didn't blend long enough), the second too slimy (blended too long).
It's dirt cheap and gets the job done. Give it a good shake before you use it, though, as it has a tendency to settle.