Looking at that pic, LOTS!
..... Hope you're going for a 3 point system.. 2 at the front (one on each chassis rail about 1200mm from the back of the cab, and one in the center of the chassis just behind the rear axle..
And this got me thinking about 3 or 4 point body mounting... and a quick google search bought be back here, but to a thread solely on flex and 3 vs 4 points.. There's a lot of discussion on it! I'm now looking into two pivot points.. One behind the cab, and one at the rear, but there needs to be a pair of carriers in the middle (one on each rail), but these middle two need to have the ability to cope with 'fore and aft' movement. The front and rear mounts will be purely for pivoting, but the centers will do the carrying.. Off to do some more research!