I don't know if the above is from IKEA or some other store - however, regardless of whether it is an IKEA Kallax or not, there are thousands of ideas + tutorials re: turning them into different types of storage - including sideboards/buffets. You simply need to do a search for "IKEA Kallax hacks for sideboards/buffets."

You might also want to look at "Besta hacks for sideboards/buffets" because you may find a drawer/doors style/idea that someone used to make Besta units into a buffet. The work would be the same to convert a Kallax/storage cube unit.

There are quite a few IKEA hacks that include adding some type of fluted type doors/drawers to various pieces of IKEA furniture. Here is a Kallax (storage cube unit) that has had fluting/reeding added to the doors:

There are many businesses that sell doors/drawer fronts for an IKEA Kallax unit. For example, I've seen the doors shown below available for sale by a few different sellers on Etsy:

I believe that IKEA sells drawers/doors that work for Kallax units - most of those storage cubes are sized the same = even if yours is not from IKEA, there components for a Kallax may work with your storage cube also. Also, on Etsy most of the seller's of doors/drawer fronts for Kallax units also have an option to make ones that are custom sized to fit other storage units.

Youtube will be your best friend for this.

Put food on it. Boom, buffet.