is FFAA a mod ?
you only need to inherit from the existing baseclass and add your own usually , Is FFAA a mod ? its not a big deal for a re texture that isnt an Hex edit but permissions are always nice.
other wise its simple case of inerting addons from the baseclass pbo cfgpatches and a simple hiddenselection repath in the cfg vehicles with rename of the vehicle ..
show us what you got