This long support is positioned about 10-12" towards the front of the rear edge of the bench. The bridge is held up by vertical panels on either end and by a vertical panel which runs the length of the bench under the bridge but not at the back of it.
A few (*cough*) years ago I found a good way of building a "bridge" as the second story on such a bench to hold gear such as scope, sig generators, etc that may become quite heavy. My post is about 2/3 the way down the page. This is the electronics bench I built for myself a few years ago. Its also a good idea to have some general storage space near by in the form of a closet or shelving to store all your components and projects you are not working on. Good place to keep general tools, soldering consumables, a set of common resistor/cap values, test cables, probes etc. The shelves also are a great place to hold the stuff you often need, right in the reach of your hand. That way you can place test equipment on the shelf to get back your bench space. If you have a typical 60cm deep workbench and you put some 40cm power supply on it you are left with only 20cm of actual bench area to use as a bench! To solve this you want your bench to be as deep as possible, about 1m (3ft) is useful, or you can put shelves behind your bench like Dave has in his lab. While some of the new modern oscilloscopes take up a lot less space with there slimmer design, but bigger test equipment soon starts to pile up on it (Especially true if you buy old 20 year old test gear off ebay to get high performance stuff on the cheap). On top of all this you also want your test equipment on your bench so that its at hand when you need to use it. Not only for any project that grows big but also room around the project to put down components and tools as you are working on it. What you want there instead is lots of space. For that a thick heavy bench is great since it will stay in place under those large forces. Where you would want such a heavily built workbench is for a workshop where you might hammer stuff on it, put a vise on it etc.
I know nobody likes a wobbly workbench, but with smart cross bracing much skinnier designs can be made solid. In my opinion the bench in the original post is too solid for electronics.
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