[Brekkie]

The split walkway is a bit stupid really as the space in the middle is completely enclosed and if putting a few fans in there you can't expect them to climb down in to it.

The second screen seems pointless to be honest and I don't get the idea of on the one hand enclosing the arena with walls but on the other wanting the cars back (even though you've kept the eye).

To be honest I don't think it works - I think you've made a mistake in kind of starting with both the C4 and C5 template and would be better off starting from scratch and thinking about what you want think the space needs to do and then create the set from there.