The build as it is was made for monkey farming with lolzcoolcat. It works really well with only tower boosting at high stats.
Here's a video of me building this
You can place a temporary buff beam on 1 to get the auras to the 6 du buff
The 4 dsts in 2 are pointed in a cross
If you want to use this build for campaign, don't place a slowness aura in 3, and don't place the physical beams, that way you get an extra lt.