I just read through the 26 pages and was surprised that the book "Clever Küchen kaufen" hasn't been mentioned yet. I have read it and think it gives a pretty good overview of how the kitchen industry works and how you have to negotiate.
What has already been written here is that you should by no means focus on a discount but only on the final price. I also find that logical and understood it without the book. However, the book explains that the hardest thing is to compare a specific kitchen 1 to 1 from different providers, since they do not release the planning documents or at least the parts lists essential for a comparison. All other comparisons are useless because that would be like comparing apples and oranges...
Another central point is basically to plan the kitchen yourself and only have the providers "refine" it. So basically go to the kitchen studio with a finished plan. I find that difficult if you are not familiar with the subject.
You also read all sorts of things about what to watch out for when signing the contract. It must be a work contract, not a purchase contract (because of the five-year warranty in work contracts), agree on a right of retention of the remaining amount until installation and defect correction (just like in house construction), have various general terms and conditions clauses deleted...
We will now start thinking about the kitchen. First, we just have to decide where what goes so that the execution planning for our house can be carried out accordingly and the connections can be planned. How would you proceed with that? I downloaded the kitchen planning software from Alno but don't find it very appealing.