Remove one side from the Kallax ‘square’ 2×2 shelves to give adequate bar height (If you and your friends are giants you can leave these as square…)
Place Kallax ‘longer 1×4’ shelves on top with the openings facing upwards. (I chose black and used a silver permanent pen to allow friends to sign)
Have a piece of glass made to fit the entire top length of the bar.
Measure and cut a piece of wood to screw in to the front of the ‘square’ shelves. Creating a solid front and holding the lower part together.
Purchase an effective wallpaper of your choice (I went with brick effect) and paper the lower front and sides (I used a spray adhesive to stick it down, this was quite fiddly to ensure all the bricks lined up. (Note I also did the back wall to the side of the bar to give it a more ‘built in’ effect.