I have been thinking for quite some time about buying the whole front subframe(engine, trans, suspension, front end) out of a FWD V8 caddy, and using it to replace the backseat of a Geo metro. The metro shouldn't need as much beefing up like it would with a front engine setup, most of the tourqe would be on the caddy frame.
TLDR Rear engine RWD geo w/ a 4.6 Northstar V8.