elkshadow,
I went to a local market to get my yeast balls (heh). I failed so found the youngest person working there and told her what I was looking for. She took me to the balls (heh) and also showed me the rectangles. She said the rectangles will make a "sweet" wine. I just bought both and figured I'll try them in turn.
She grabbed a couple of the older men there and rapid fire translated for me. From that, she told me that I could use one ball for 10 lbs of rice. That seemed a little thin in coverage to me. Then again, if anyone has read about propagating, ummmm, mushrooms, as long as you're sanitary and patient, it only takes a few spores to get the growth needed. She also told me I could mix it up and stick it in the sun for a few hours (mid 90s that day) and have sweet rice that quick. Then she told me that she doesn't make rice wine and drink it because it's only 40 proof.