The below vehicle scale is based on the scale rules from Legends of Anglerre.
I was forced to scrap the idea of having no stress boxes, only consequences because I wanted to make the larger scale vehicles more difficult to kill but didn’t want the players/GM to have to track a vast number of additional consequences.
Each vehicle has it’s approaches rated at +0 by default and receives a number of points (based on their scale) to spend on increasing their ratings on a one to one basis.
Vehicles can only directly attack others that are a maximum of 2 scale points lower or higher than their own (individual human sized characters count as scale 1), each Stunt devoted to this matter can increase this limit by a single point.
Otherwise Stunts generally work the same as normal in Fate Accelerated (either adding a +2 in certain circumstances or allowing the vehicle to accomplish something ‘cool’ 1/session as per the Fate Accelerated rulebook); each Stunt costs a point of the vehicles Refresh (no vehicle may have a Refresh of less than 1).