Steve,
At a minimum it will need a front clip, (2,500 for just fiberglass), suspension front and rear (probably frame and control arms need replacement), (wheels/axles),and quite possibly transmission looking at how hard the hit was to the rear...........
If one could do all the work and was willing to completely strip the car down and rebuild it, its probably worth 10-15k. It will still have a salvage title and not be worth much on resale. (but a cost-effective route to ownership if you really want it) Scott