I'm Fewd! I stream every weekend and am always willing to help you out. Feel free to check me out or ask questions on Twitch, Steam, or Discord.
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Twitch Link: https://www.twitch.tv/fewd
Steam Link: https://steamcommunity.com/id/fewdpoonz/
Discord Link: https://discord.gg/Vt2KR3e
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Build Start:

1. Place the Strength Drain and Ensare auras right near the Forge-side of the Crystal on the left and then again at the base of the Left side of the Crystal on the Right as shown above.
2. Place 1 Shroom Pit in the middle of the floor between the Left Crystal and the Stairs.
3. Place 9 Wisp Dens in a grid-like pattern as close to each other as you can with the middle Wisp Den starting from the middle of your Shroom Pit.
4. Place 4 1-DU Reflect Beams around the outside of the grouping of Towers. Each one should only cost 1 DU and every corner should be fully protected and covering all above towers.
5. Enjoy!

Key things to know for the build: 

• You can start Survival on wave 32 for farming a decent Skeleton on a Treadmill Builder Pet. 
• Upgrades aren't necessarily needed, but with how high the Drop Rate is on Chests I typically swap to an Upgrader and collect each chest then swap back  to TB. (Time consuming & not necessary)
• I use a Tower Booster and 3 Boost Summoners (Range, Defense, Speed) for every wave. I haven't tested it often but this likely works if you use a 4th DPS Summoner with long range pets instead of a TB Monk.