You should start with a back bar, suggest:
http://www.micromatic.com/product.php?pid=BB94
A back bar does not come with towers or drip trays. You will need the space to mount the Vienna Elipse (6 faucet) towers, as they are 18" wide. The widest flush mount drip tray is 12", a custom made flush mount tray would need to be made, it may also not be under all the faucets. I suggest a surface mount drip tray with a cut out, see:
http://www.micromatic.com/category.php?cid=519
You will need to mount a blower in the back bar under each tower to keep cold air circulating in it. Please see the top 3 items on this link:
http://www.micromatic.com/category.php?cid=151
By the way, are you going to fill the back bar with 1/6th kegs? You will also need tapping equipment for these kegs. Please call our customer service at 866-291-5756 and we can help you with more details.
Mike Godwin, Micro Matic USA, Inc. Northridge, CA