In the doors there are small 1/16” kerfs added . To achieve this I considered to make the door in layers but eventually I bought a Pheil cutting knife from 1/32” (1 mm) and curved it into the wood. Maybe 1/16 would have be a better width. Please let me know. There are also 1/16” (2mm) cutting knives. Benefit of this knives is that the knive widht almost automatic will be the kerf width. You may not believe me but in real it looks better than on the picture.
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-- My englisch is bad but how is your dutch?