Before you start make sure you're on a builder with enough mana. (do this on phase 3 obviously)

Getting it done in time takes practice.

Some ppl prefer a single aura stack at the middle, I prefer 4 stacks. Always do the auras before the buff if you use 4 stacks! Otherwise you might not be able to place them correctly.

Buff beams connect 2-2 aura stacks + gas traps. (6DU beam)

NEVER place the buff on the minions. If they die from dragon balls / demon fire it'll destroy the buff.

Minions are around the edge of the stone circle.

When you summon minions don't bother with careful positioning, that's the main reason why many have trouble doing the build in time. Start with a mage, start the archer while mage is being summoned, place it outside the mage's summoning circle or a bit further away. Do the same with the next archer, by the time you start summoning it the mage is done so you can start the next mage while archer is being summoned. Continue until you close the circle :) Having minions on hotkeys also helps a lot.

Some ppl do spiders, i don't think it's necessary. Archers have more hp and can survive longer plus ogres don't spawn as frequently as they do on other maps.

My solo build order is minions - aruras - traps - buffs

Make sure you swap to your DPS before time runs out. (I recommend monk for bosses if you solo)