Probably not the fastest build out there, but it certainly works. I get 12-13 min combat times.

• TB + Guardian builder wave 1, then upgrader until max. After that, running around with a DPS Huntress / Apprentice helps with killing certain bosses. (2 Splits) On final wave, I would do a 2x Huntress Guardian Summoner and a builder Guardian.  
• Both hint 2s are options you can do (swapping Mortars for Holy Cannons). Cannons have longer range, letting them help with Super Copters, but are worse at dealing with bosses up close.
• I love Guardian on this map.  You can definitely do some messing around with possibly replacing Golem / Spore for Bulwark / Obelisk if you don't have Hermit, but do have Guardian. On the other hand, Owls are just superb. Even though they don't have the highest boss damage, they do very well with general mobs, Super Wyverns, and the mini Spiders from Spider Queens. 
• Mortars from Squire kill the bosses that get close. 
• If you want to go for Flying Pumpkins / the secret boss, Empowering Shrine helps a bunch with that. The boss was never really that hard, but shrine makes it a breeze. As mentioned before, DPS Huntress or Apprentice for this.
• Ironically, this map is great to farm for Guardian since it's one of the best builder sword farms. If you can run it at the same rate as I can, you're expected to get more Corrupted Axes / run compared to Valentine Citadel and Fish. (0.25 Corrupted Axes / Min vs 0.2 Fish / Min with my typical times for both maps. Axes also have better ++ rates... AND you're also farming Dragon Halberds that have similar rates to axes, which is a nice bonus.) 

This map is still definitely one I'd recommend higher stats (6-7k+ Main) to farm comfortably, but it's nice having another option for it. :3