My only concern would be that if you are using a lot of sawdust then make sure you don't separate too much
urine as the sawdust really does need a bit of help to make it break down and you might not get the poopy bit of the heap hot
enough without either
pee or plenty of scraps. But if you're only using sawdust in the buckets and then using
straw or hay as a cover material on the heap it
should be ok.
If you invest in a compost thermometer you can check very easily if it's reaching a decent temperature. If it is, then you have no problems. If it isn't, it's kind of fun to fiddle around adding more pee, adjusting the moisture level, until you've perfected it.
Well, I think it's fun. But then I'm bit odd...