I do agree with the premise that we need more old and abused models instead of shiny new sports cars or tanks. We need the post-apocalyptic models, the vehicles with welded on steel plates.
Some of your ideas are contradictory: Look at items 2 and 2.1, you want to REMOVE bloodbags and morphine. Then you want to create a model and scripts to allow one single item to do EXACTLY what the items you removed were doing. How about just modifying how bloodbags and morphine?
And what about #4, that is EXACTLY what the current vehicle spawn system does. Once a vehicle is destoyed, it is respawned.
Specially in epoch you actually find people hoarding 20+ cars in bigger bases, there should always be a fight for those but nobody cars if they are bought/locked.
#3.2 is what food does now, just modify the values you want.
Many mods tried to establish this "rare amount" of food/drinks and failed due to lack of players, i do know that very well.