A space-frame would be in line with FIAT policy of the early 2000s, but I don't agree with the choice of a Stratos as a basis. My humble opinion is to take one 500 Abarth (actually 2), cut it in half and weld it back to front. The trouble is that it would end up as one of those Smart Roadsters, and they didn't fare well. The crash bit is easy because you have the whole front to collapse, with no engine, which is even better. It's a dirty trick that no manufacturer reveals: crash tests are always done with the "basis" engine not because they are the most common, but because the "big" engines seriously affect the crash performance.