The second one requires a roof, but a special kind of roof (hard to explain I'd have to draw it), a stunt airbag, some nice strobes, including one, possibly two interval strobes, and probably an ND filter to get the exposure length I want.
Of course that is negating the model(s), and I'd probably need a wider lens than I have now, at least a 20mm, possibly down to 16-17mm to get what I want in the action (though thats getting a bit distorted). I'd like a higher MP camera too, probably a Mark III 5D at least, though renting a digital medium format would be awesome (though they are pricey as fuck to even rent). That way I could use a longer lens and still get the detail I want, just pulled back a bit more in the scene. I don't know, some of the specific technical details I have not worked out entirely in my head. I have an end result in my head, the fun part is getting to it.