lighten up a CRX, the 90-91 models have a lot of CF available, but then you'd be spending a lot of $$ to end up at the same weight as a 1st gen CRX.
Seriously though, get a HF, toss the engine and replace with a small diesel.
This one might work, but turbo-diesel would be better I assume.
You wouldn't be getting 0-60 any time this decade, but man the MPG would be killer.