Thanks for your input, Bingo.
What do you think about dropping 5 entirely and merging 3 and 4 instead?
I'd like to end it with a bang; e.g., Caesar saying "... and that day is upon you... NOW!" and then fade to black when the apes start cheering.
I'd like to cut as much from 3 as possible; only leaving in what's necessary to setup the baby-Caesar plot.
The problem, of course, is coming up with a good way to transition from baby-Caesar to adult-Caesar.