Yes that's what I mean, not over the first bridge (so perhaps correctly not over Bridge). It's a big meeting (in space terms) and I imagine that the inside of the circuit will be filled with teams and support race teams. I believe that there are plans for more entertainment than last year and that will also take up space in the centre.
No last year you could not get through the main entrance at all, you were forced to park in the car park to the right which meant that you had to leave the 'circuit' to get anything from your car. Also, annoying was the fact that there were no car parks open at all down at Stowe, so if you wanted to view down there then you had to walk. Also all the grandstands on the hanger were roped off but I seem to remember getting onto the seats at Stowe corner. As for camping, if I had been going this year, I would be tempted to carry in my stuff and set up down behind the vale, or at Stowe. All the toilet blocks were open, so though not ideal, because the crowd was so small and most likely will be this year, then you would be comfortable enough for one night anyhow.