Sensacells come in two varieties, HSI and M-30s. These are HSIs which is the higher resolution. Being divided into 4 chicklets would allow one to space out the square a few inches appart, and offset at different heights, rather than place each right next to each other as shown here. The alternative would be to mount the tiles onto a single 1/2" 4'x8' piece of plexiglass. Each HSI tile is less than 6" square and has 6x6 LEDs and 4x4 sensors. The M-30 (not shown here) is less than 12" square and has 4x4 sensors and LEDs. They are sturdy and can be used for floors, walls and furniture. Yes a bar top would be great.
This is programmed this in Flash/AS3. Currently this has 9 sets of sound samples and four note image types.