Scion needs an Improvised Weapon system

I've become convinced that Scion needs an Improvised Weapon system. I may have to design one myself. My preference would be more like AEG's system from 7th Sea, less involved than Atlas Games' system from Feng Shui. But, unlike either of those systems, it has to handle using 18-wheelers and Naval Vessels as projectiles.

Edit: I have a system worked out, and have since posted it. Click on the ImprovisedWeapons label to see everthing I've written on this topic.