*** The shelves are NOT adjustable.***
The assembly was not easy. Compared to all the furnitures that we assembled over the years (even IKEA ones), this one was the hardest. Also I was hoping not to use the shelf in the smaller compartment but its not possible as the shelves are not removable or adjustable. Aligning the doors was the toughest part.
Overall the finished product looks very nice and fits perfectly.