The rear quarter panel can be an easy fix if you know how to weld and do some bodywork. You'll want to find a donor car and cut out the section you need on the quarter and the other parts. You can also find quarters on ebay for around $300, but are for non-wagons. You only need that small section it appears in the photo. You can cut out a donor, ask in wanted here for that section of quarter panel, and then cut out yours to match or the other. Tack weld it in place and then grind it down and fill it and paint.
I don't know what other damage is from that impact, but you'll need to fix whatever than cosmetic of course

Nice car and love the seats!