well, my progress so far:
- left some important time at step 74

- lost some hours at step 91 and 93 ... discovering after these both steps, that my folds were not in the correct ratio
- fortunately I only had to perform a spread-sink (I think it was one

) to get a result like in the diagram of step 94
- 105 was easier for me performing it 5 times ...
- "liked" step 129 (repeat steps 94 - 128)
- I thing I did not perform everything correctly at the steps 131 - 164
- especially liked step 165 (repeat 138-164)
but:
I´m struggling with performing 182 - 190 ...
- in 183 it says that I have to pleat and repeat it behind - do I have to pleat the top pleats also (= pleating all the paper) ?
- it is the same with 185 ?
- I can perform some folds to receive the "basis" of diagram 192, but I can´t arrange the flaps in the middle, to receive the "full" 192. I have tried for several hours right now, trying different folds/arrangements, but nothing seems to work ;-(
do you have any hints ?