Build video link: https://youtu.be/LraCqjuVIWE

This build averages 30 minutes of combat time and around 5 minutes to build. Took me a while to make, so share it around for the community.

Note 1: This build requires 7.5k Aura range and similar builder stats for Gold enemies

Note 2: Black dotted lines are the outer range of a turret's yellow LOS

Note 3: "x" means multiple builders are stacking in the same spot. To achieve this, have the builders out on ALT's and pre-place towers the way that you would normally. (See Video)

Note 4: Tower Stack placement is necessary to stay within the Tower Boost range!

Build Description:

North/East STR Drain is placed on the boxes below the ramp to the East of the spawn

South STR Drain is placed on the boxes to the West of the Lower Spawn Door

Hint 1: The Buff Beam must start on the outer lip closest to the bridge, directly in line with the southernmost tip of the Spawn Door to the west. The beam goes off the ledge into your Aura.

(3 Builders out required place on the ledge as close to the bridge as possible)

1 S.A.M. x 1 Shroom Pit x 1 Wisp Den x 2 Cloud Towers x 1 Mortar. 

S.A.M. and Cloud Towers Face Due North with the right-most edge of the LOS just North of the spawn door to not draw aggro on the mobs that spawn there, Mortar Faces spawn N/E covering the spawn door.

Hint 2: Buff Beam goes from the middle of the rectangular box closest to the north end, going over to the castle nook due west

Mortar is placed on the castle nook, covering the upper spawn.

(3 Builders are used, all placed as close to the edge of the rectangular box as possible)

1 S.A.M. x 1 Wisp Den x 1 Shroom Pit x 1 Sludge Bomb x 1 Cloud Tower

All of these face due West, with the southmost edge of the LOS facing the black dotted line

Hint 3: Place an archer on the castle nook in the corner above the spawn, jump on the archer with your Tower Booster, jump across to the upright bridge support. The Tower Booster Must Stand in the North West Corner of the bridge support to hit both tower stacks.

For the waves after upgrading:

1 TB on the Hint 3

1 Warden Builder in a safe spot (ramp below hint 1)

2 Summoners with a Monk and Huntress guardians, one standing on each tower stack

This build spawn kills the gates with mortars, and the North Web wall + Clouds kills everything before it rounds the corner. 

The Golem Aggro's South West Spawn Ogres and Machines, while the elevated tower stacks kill copters before they drop ogres.