The first time i finished the left half, it looked completely different than the photo! I did manage to get the crabstitch rounds, but there were other elevated rounds, i didn't have. Finally it came to me, that some of these elevated rounds were one round of sc, the next round sc over the same base stitches, though it didn't show on the chart. All&all it took me 4 days to get it (nearly) right.
On the work sheet on the right of the photo you can see what a messy process it is.
And here is the result. Using pink pins is pun intended:)