I am ready to give you the answer! Sit down, @faust, you got F for the Maths.
Ok, so I tried to calculate the height. Let's assume the woman used on the picture is 1,65 m height. The difference between woman's "height" observing from ground to the top and if a woman is on the ground is roughly 25%. We used 18 women to build a "women tower". Let's assume the height of a woman is in range from 1,24 to 1,65. So we can state the average women height is (1,24+1,65)/2 = 1,445 m.
So the height of the tower (not women tower) is 1,445*18= 26 meters, that is 85 ft. Adding one more woman (if we are are falling) and it is already 27,445 m (90ft).
Now checking if there is any possibility to hit the tower while falling.
1,24*2 - 1,24*0,33 = 2,07 m. You have to fly around 2,10 m away from tower not to hit it. Well, possible, but it is not easy to jump from the handles and you can slip. If you are Rambo, you can take a running jump (not a good idea if you never did that).
So, in few fords, this is risky:
1) You are jumping on the grass
2) There is no guarantee you will jump that far even if inertia helps you
3) The flight does not last long, you won't be able to change position just in case
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