Hello Chippenchen and welcome to the forum. How exciting to be moving into a new house

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It looks to be a well built kitchen and I like the stone on the benchtop.
The glass splashback would be very simple to do but should be the last step.
The upstand is a little different to normal. Do you have a picture of the other side of the kitchen where you see the whole upstand?
Are there any overhead cabinets on the other side of the window?
With cabinetmakers we are now approaching the silly season. The good cabinetmakers are most likely to be booked out until January next year. If you can wait until February/March next year more should be available and usually for a better price.
Replacing the drawer systems to soft close should be easy to do. Replacing the doors with 2 pak painted doors can be more difficult. It's all the frames, bottoms of overheads, end panels- all the fiddly bits that makes it difficult. A cabinetmaker would have to look at it and see if it needs to be all removed to or just bits replaced.
You can look at painting it yourself- others have done it but personally I wouldn't risk it not having a good finish.