So, basically, it was about 3AM on the Overwatchers server. We were screwing around on hugeflatmap, and then Uzisoft and I built THIS. It's nowhere near an Uberfort, but it was the work of just two people, and we had some actual fights in this thing too.

The entrance at two different points during construction, one with ammo/rechargers and one without. I was responsible for the top of the arch, the over-arena pathways, the ramps, and parts of the upper rim, but Uzi did the rest of it.

Ground-floor view of the arena from the right side. Like I said, the over-arena ramps were my work. The huge ramp in the background was the work of about two or three people, but I don't remember who.

Two of the Airboats duking it out in the arena, pre-equipment.

Shots of the left and right ends of the arena, from slightly different angles. The big ramp in the background by the airboat spawn was all my doing, before I got involved with the arena.

Shot from the back of the arena. Note that that's 100 MINUTES, 24 seconds on the build timer, the only reason we got this done. We never really intended to go combat at the time, and thus we had no flag D at all.

Three-stage, slightly overlapping shot of the big ramp going up alongside the arena. I think they were building a skybox for the thing, though I never asked.
I didn't get any shots of the epic fighting that we and the rebels later had in this thing, sadly.
Props!