not gonna lie, but if you create a custom sawblade, (like i did with lasers and immortalizing the blades,) you can make it stronger so that it cuts apart indestructile items.
and i upgraded your machine a bit, you want my upgraded version? you dont have to give me credit since it was your idea, i did not add shredder gears or anything like that, i just changed some collision and physical stats.
oh! that cpu usage, great job though, its been so long since i have seen anything but ball corses and camps that i cant even filter because people are too lazy to add tags.
you forgot quadiary, which is when you combine a secondary with a secondary, which are colors in ultraviolet, and some really pertiuclar in between colors
and i also just found out that single variables (inside a object) dont stay when you publish a scene, its kinda strange, you might want to have a look at that in algodoo's scripting source, its probably just something, i did add variables to it though.
just gonna say, not realistic at all, cars dont fracture, they actually complicatedly deform and dent. so yeah, and thats not possible in this simple physics engine without some REAL skills