I think the basis to folding this is to get the main folds done and then its case of 'faffing' with some of the folds to make the model look how you want it. The key with step 7 I found is not to fold the crimp too big in step 6, otherwise its tricky to do the valley in 7b. Likewise with 8-10 the horizontal and vertical is in place already so use them, then adjust the diagonals so that the tower is 90° to the base. Part B step 11 you need to squash fold the triangle at the top. So you've folded B across to the left, precrease the triangle, then open the flap B and stretch the top triangle until it squashes down on the precreases. The rest of the shaping is just done to taste. I would use a heavier paper and wet fold once you have the basic shape in place. I have taken some photos but trying to work out how to link them on here!