I might just be being impossibly thick, but after using the rift to reach the right hand side phantom coil, it seems I cannot go anywhere else. I don't see any other rifts anywhere on the map, and I can't build anything at all. I even tried destroying the 1 beacon to see if there was a 1 beacon limit or something, but alas no. So, can't reach the ac things in the middle. Can't do anything or build anything. I like the idea of a map not being a complete 'mass units and zerg' fest but this seems a bit silly.