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How to Rat in a Gila
The Gila is more expensive, less tanky, and insures worse than the Dominix. However it makes up for this with the ability to field cheap and extremely difficult to kill drones, and more importantly the ability to run both Havens and Sanctums.
You can make around 12-16 million isk/tick (every 20 minutes) using this fit, before bounty modifiers and the ESS cut.
The Ratting Progression Chain

The Vexor Newbro Edition
Gallente T1 Cruiser
~20 Million ISK Low Skills

The Ratting Myrmidon
Gallente T1 Battlecruiser
~90 Million ISK Low Skills

The Ratting Dominix
Gallente T1 Battleship
~250 Million ISK Medium Skills

The Ratting Gila
Guristas Faction Cruiser
~300 Million ISK Medium Skills

The Isktar
Gallente Heavy Assault Cruiser
~300 Million ISK Medium Skills

Ratting Carriers
Minmatar Carrier
2-3 Billion ISK High Skills

Ratting Dreadnoughts
Minmatar / Amarr Dreadnoughts
3-4 Billion ISK High Skills

Ratting Supers
Minmatar Supercarrier
17-20 Billion ISK High Skills
Fittings
The Gila is able to fairly easily run sites in both Catch and Impass. Both fits are Passive-Regen tanked, meaning they have a very high rate of natural shield regeneration that allows them to tank a site while orbiting with an afterburner.
Before flying the below fits, please ensure you are cap stable!
Impass
[Gila, Impass Gila] Drone Damage Amplifier II Drone Damage Amplifier II Drone Damage Amplifier II 10MN Afterburner II Multispectrum Shield Hardener II Multispectrum Shield Hardener II Large Shield Extender II Large Shield Extender II Large Shield Extender II Rapid Light Missile Launcher II Rapid Light Missile Launcher II Rapid Light Missile Launcher II Rapid Light Missile Launcher II [Empty High slot] Medium Core Defense Field Purger II Medium Core Defense Field Purger II Medium Explosive Shield Reinforcer II Hornet II x4 Valkyrie II x8 Scourge Fury Light Missile x5080
Catch
[Gila, Catch Gila] Drone Damage Amplifier II Drone Damage Amplifier II Drone Damage Amplifier II Large Shield Extender II Large Shield Extender II Large Shield Extender II Multispectrum Shield Hardener II 10MN Afterburner II EM Shield Hardener II Rapid Light Missile Launcher II Rapid Light Missile Launcher II Rapid Light Missile Launcher II Rapid Light Missile Launcher II Medium Core Defense Field Purger II Medium Core Defense Field Purger II Medium Core Defense Field Purger II Hammerhead II x2 Hornet II x4 Hornet EC-300 x4 Infiltrator II x4 Inferno Fury Light Missile x5000
How to Run Sites
The Gila is unique among subcaps in its ability to run both Havens and Sanctums safely and effectively, along with lower level sites like Forsaken Hubs and Forsaken Rally Points.
Despite this you still want to avoid sites with Forlorn or Hidden in the name, as their spawns can still overwhelm you.
DO NOT run sites in GE-8JV. You are very likely to lose your ship due to high PVP activity.
Sanctums
Sanctums need a bit of special attention due to their unique spawning mechanics, and therefor requires pilots to be active throughout the site. However just the ability to run these sites in the first place is incredibly valuable for a subcap.
The Gila is only capable of running Ring Sanctums, NOT Station Sanctums.
In Catch, Ring Sanctums are capable of spawning a wave that both points and webs you. This can rarely lead to a situation where your tank is quickly overwhelmed by fire from the battleships and you are unable to warp off. For this reason, you should immediately focus all fire on any ship that starts webbing you in these sites.
All Other Sites
With all other sites, including Havens and Forsaken Hubs, you can follow the same process as you have up until this point and run sites in a semi-AFK manner. Bear in mind though as with Sanctums using rapid lights to kill frigates will decently improve your payouts.