Big with lots of room. I might be a little concerned with running that big of a fire in a wooden box and next to a stack of wood, if a good sized spark drifts into that wood pile and gets it going it could be bad.
It looks fairly new based on the fact that the walls are still brown instead of the standard black caked in soot. Are the walls OSB? It is kinda hard to tell. The thing is huge, but why stack the wood inside??? The meat looks good though, and in the end, that is all the really matters; does it taste good.