Windswept Haven Arena - Hole in the middle???

We were looking forward to claiming the new hall.. and then we saw the picture of the arena. Who thought it was a great idea to put a giant kitten hole in the middle of the fighting area? Makes it completely useless. As a wvw guild the arena is really the only place that gets use in our ghall. Does anyone that has claimed this hall know if the hole is 'pluggable', maybe like the barriers you can erect in Precipice to stop people falling out into the water?

If there is no way to get rid of this hole, I have to say this is TERRIBLE design and please consider changing it.