Right the orbat is a bit old and does not account for the latest and greatest missile you can add 2X DF41 brigade and maybe 2 X DF31Aso I can see the number of brigades; 2x DF-5, 2x DF-5A and 3x DF-31
Where are DF-5B and DF-31A and B and DF-41?
How many missiles are in a brigade for ICBM ?
Don't know how many missile in one brigade using low number of 12 you see there are at least 11 or 12 brigades so roughly 150 missile but does not counted MIRVED warhead and JL2 series
Assuming 5 warhead per mirved missile that is 120 warhead add 3X12X4 for JL2=144 warhead
So you are talking about 300-400 warhead