So, we decided to covert the bookcase into display cabinate. We took out all the shelvings from the bookcase, repainted the whole build-in units. Added pilaster and clip to the side of the build-in wall. You can get the pilaster from local hardwood store but we get them from a internet website because of the price different.
We also found some strip LED light from local hardwood store that we could installed along side with the pilaster.
Reinstalled the shelving to the right height. With the adjustable system we managed to put my shelving to the height that we need for displaying my collect. Also, with the build-in LED strip light, We managed to show my collection off better. The LED strip light has adjustable brightness. We it work really well with the display. We then rearrange the furniture around the fireplace. Here you can see how the room is look like now.