This is a build I used several years ago before many changes were made. It is not a meta build, and did not work for mixed-mode, even at that time.
This build also utilizes minion walls and not stacking. Minions should be far enough from the crystals to prevent Ogres from hitting them.
Will need roughly 1800+ on stats for all your builders to work this build effectively.
I use this build mostly for Seahorse and armor farming.
Note: If you stay on your summoner, only armor will drop, no weapons, this will accelerate good stat armor acquisition.
Hint 1: The gas-trap should touch both the buff beam, and get to the corner of the building to the NW at full-size, but not touch the spawner.
Hint 2: Eastern Reflect-beam needs to touch the south alley wall as copter missiles shoot down along the wall. This location experiences the most pressure during waves due to Copter-Ogres and Sharken. The minions on the south-side here are the only ones that do not have a mage in healing distance, but should not get much action if the gas-trap up the stairs is placed effectively.
Hint 3: This location gets the least pressure and should be able to effectively snipe enemies at range.
Hint 4: The harpoons at this location should be turned so that their line of fire does not pass the eastern wall, this should prevent good armor drops from being out of reach as copter-ogres are killed just outside the confines of the map.
Cheers for the nostalgia!