Actually, there is a designer who has designed a sofa/table piece. You can see it here - http://kononenkoid.com/julia-kononenko-projects/convertible-sofa. That may help you visualize your planned project.

The red brick wall as a backdrop sounds very interesting. You can get quirky posters of various liquor brands like Jack Daniels, Chivas etc in black and white and get it framed and put them on the wall. Also industrial look is very in so the bar top can be done using a copper sheet over a plywood top instead of traditional granite or marble. Also utilise any empty beer bottles or wine bottles to make a customised chandelier. For stools you could have wrought iron stools with leather seats matching the brick wall. A small wall shelf with a display of shot glasses will make the look more interesting. Hope this is helpful, it will be great if you can share pictures of the area to give some more inputs.

'Supreme" chairs come in dazzling colors.I flipped for them when in Kerala but bought them while at Vijayawada. They are available anywhere and are water resistant, strong and too cute to look at. I am yet to find a table to pair them with but will do so soon. red,lime green,black,white,brown,blue,yellow...my god.The colors and their vibrancy is awesome.Many more colors as listed are available.

A McSo. Couldn't the base of 15cm overhang be supported end to end with steel. As a single steel structure mounted on the larger cabinet area visible here. It should be sufficient for supporting the extension. Corbels will provide additional support but IMHO may not be required. Have you thought about an semi circular or a D shape counter to avoid sharp edges. Thanks, Nitin Cornerstone Designs, Bangalore.