Page 12 of the book Shows this wunderfull pattern and it makes fun to knit the umbrella.
The book is written in German language and contains also other nice Lace pattern.

How to organise the umbrella: I found a Person who had some wooden umbrella on stock because he repaired umbrellas. This person already retiered and I got the umbrellas for a low budget.
The suggestion to take a new umbrella and exchange the “Roof” seems to be a bit more difficult but I have not tried that yet.