The idea was that there aren't enough civilian cars on maps for terrorists, so I would have a building that made them.
I do not want to make just another suicide unit.
The technical script to get a random car from a selection, I will look into it.
The building that made civilian cars would be use a civilian structure model that looked like a car dealer - because thats what the building would be. A car sales yard. I dunno what ya've got in the US, but here we don't get terrorists free with our cars

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The question remains: can I build a Civilian team unit from a GLA team building?
Yes, I am new to this, I started modding Generals 4 days ago, but I have already successfully modified the humvee and created a new unit based on the humvee that has different weapons, cost, armour, etc and builds from the USA war factory. At this point I want to expand to making a structure, but want it to serve some plausible purpose. A car sales yard where you buy cheap cars for terrorists seemed like a good starting point. In Generals terrorists are pretty much the only customers it could serve, but it should be interesting.
Can I build civilian team units from a GLA team building?