Cool, you should see some big gains towards the midpoint of your rest week. At the latest you will see them at the beginning of the next hard cycle. The extra work is ok, but only as long as you are doing it a few hours apart from your other workouts. I made some great gains doing this program and then stacking repeat 200m sprints and 300m sprints tempo style on the other end of the weightlifting days, it didn't hurt anything.
Yes, this program will really help your elastic strength and eccentric handling in your takeoff leg. The main differences in the program now is the lifting is more oriented towards singles at 80% on the oly lifts and more eccentric tempo on the squats with explosive concentric phases. Also I have more single response plyos than straight jump endurance. You can mix it up a lot though. I think the key to long term is 2 week block focus, i.e. block 1, strength emphasis, block 2, single response plyo emphasis, block 3 jump endurance plyo emphasis, etc.
As for exact program specs, pm me and I can get you a new sample if I have some time. I am writing a book that will be for sale in a couple months when I get the site up that will have a ton of ways to alter this program in it.