It is a misconception that functionality will be affected. As long as you ensure that the cabinet can be opened and close without any difficulty and as long as the material stored inside is kept safe, there should be absolutely no problem in making these customizations to kitchen cabinet designs.
If you take a look at all other electronic devices and furniture items used in the kitchen, you will realize that there is very little scope for customization and design. You cannot paint your microwave oven in different colors, can you? You can not have any paint or other such design on the stuff, can you?
While custom-cabinet doors are more expensive than the do-it-yourself variety, the advantage is that you are able to get exactly what you want at a very high level of craftsmanship. You can tailor the cabinets to the exact specifications and needs of your kitchen.
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