You will also probably need to tighten up part 2 as well. Part 2 being the detail of needs (and/or dx) and part 3 being the "prescription" to those needs (a bit like a doctor's prescription). Without part 2 being correct, part 3 won't stand a chance of being right.
There is case law that LAs should do each part of the statement in strict order - therefore you can't do part 3 until part 2 has been tightened up.
Part 2 is quite good as all the reports were definitive and in agreement - all his needs are addressed - before reading the statement for the second time, I wrote a list of all of his needs and they are all in the statement. I just need Part 3 to be quantified.
dds is about 8 pages, although not sure if thats any help as at the moment its full of rubbish. seems like you are having the same problems as me - part 2 accurately describes needs but the provision in part 3 to meet the needs is dire