Creative use of event prizes...

Anciles are good combined with mags piñatas or aphids, all are fun setups (except piñatas haven't tried those with ancile yet). Aphids are good on Jesse Gepard Patton Leo griffin and kind of on the stalker. Natty, trident pins, Zeus gekkos, treb gekkos, tempest molot. I have 2 orkans and am almost always running them.

I've got a Leo (won with crazy paint) with an Ancil and Gekko x3. I don't know how much time I'll invest in leveling up, but it has its uses.

Two light weapons only...

Vityaz is actually a decent support bot with an Ancile and Magnums or Punishers. It turns a standard Thunder Lance into a Super-Ancilot. Vityaz is agile enough to keep Lance inside the Ancile bubble and it is not too squishy when you're under plasma fire. The Vityaz/Lance hybrid has two light, two medium and one heavy weapon. It's a face wrecking combo.

The most potent Ancile bots are Natasha, Carnage and Raijin. Each of these bots has its own sub-role in battles. Carnage follows and protects heavy armed knife fighters. Natasha is for taking enemy beacons as it can advance with a rotated turret so the Ecu can eat plasma. Raijin is for fortification of blue beacons.

All of these three bots are in my active hangar when the event tasks want me to win battles. Ag income actually sucks from using these bots. But in return you get to witness the most epic scenes that this game has to offer. You become the front line. You are Gandalf yelling to the Balrog that he shall not pass. Everyone is shooting at you and your well protected team mates are cornershooting like crazy from behind you. Seen several players doing new damage highscores from within my Ancile bubbles.

Double Ancile Raijin is an option, and I concur with the above assessment. I tried the Ancile/Thunder combo before, but I just tried this last night and tried to make it work. You need to use it at the right time, but it's amazing to just walk up to a beacon and push them back. The funny thing is that this bot will draw lots of reds to you. I've had 4 reds walk over to the side beacon on Shenzhen, usually one of the most contested beacons on that map. I held it for a really long time, and 2 DB Griffins were not enough to make a dent in my Ancile. Plus a plasma Stalker was trying to shoot at my physical shield, and another Galahad ignored me and went for one of my teammates. You're basically a sponge for all sorts of damage, plasma and DB and RDB. The 2x Anciles recharge fast enough. If you bring it out first or in early mid-game, then usually you're safe from Ancile poppers (Thunders). Usually they come out later when the Ancilots come out, so it will take a while for a disorganized random red team to counter you and take your beacon. 

I'm still refining my strategy with the 2x Ancile Raijin. But use it on maps with really contested beacons. You can sit on the beacon, but often times you can choose a better defensive spot close to the beacon. Then your teammates can use your Ancile to protect from rockets, and you will draw all sorts of fire from them. They'll likely survive longer and get really high damage scores while you will suffer a bit. Your goal is to hold a beacon as long as possible, and draw a lots of reds to you. The battle will play out several ways. Either they come at you one by one, and a friendly blue will kill them for you. Or you'll get epic battles where all the reds and blues are drawn to you, and you'll watch the carnage around you. If your team is smart, your team will actually use this opportunity to secure more beacons. By the time you die, your team should have the beacon bar advantage or at least tied. 

Yes, there is actually some strategy with this build even if you can't attack. You do want to position yourself near your teammates if possible. Also, you want to be in a somewhat favorable and defensible position if you're gonna use Bastion or set up shop somewhere. So not only do you have to pick the right beacon to defend, but where to defend exactly. You're also free to change beacons esp. in a small map like Moon map. I started protecting the far right beacon, then during a lull in combat, I set up under the tunnel tucked away in a corner to protect centre beacon. During that time, they weren't able to change our home beacon, and then we fortified the centre beacon so they couldn't capture it. I didn't have any beacon captures, but I helped our team hold on to beacons. The last thing is being a moving screener like in basketball. So you want to be able to walk so you can jump into firing lanes to take rocket damage for your team. Your shields are strong enough that you need to be actively moving around and absorbing as much rocket fire for them as possible as your teammate and reds will sometimes try to ignore you. Also, you need to move to get away from danger. Maybe you need to let your Anciles recharge, or your position was gonna be overrrun with reds. Just because you're wearing double protection, doesn't mean you can just sit in one spot until you die.