I neglected to mention - I love the nipple waterers because there is a source of clean, fresh water ALWAYS available. It's always clean and fresh, and all you have to do is refill it. I wash out the whole thing every few weeks up to a month to remove any biofilm. So much easier than any other...
I agree, 8 wks is too light to really utilize the rat proof capability of the treadle feeder. I love mine though, now that my chickens are heavy enough. Mine were heavy enough by about 3-4 lbs.
For nipple waterers, I would train them to use them. Yes, you have a water source close by, but...