The doors and seat were "Free" or a "sunk cost" depending on how you look at it.
I had already bought a crashed Volt (same make/model/year) as a parts vehicle for the battery pack. I pulled the doors from that car.
On the original auto body repair estimate the doors were almost $1500 each.
The only real money I have into repairs so far is about $15 at Harbor Freight.
I still need a can of touch up paint at a minimum, but probably also going to try a little more body work, Bondo, etc.
I tried doing a little auto body work myself.
I got a "Paint-Less" Dent Repair kit, which you use a hot glue gun to attach a tab to the metal.
I also ended up removing the interior panel and trying to get at the sheet metal from the inside. I ran a socket extension through and pushed and banged on it to get some of the dent out.
When I was done, I had gotten much of the dent out, but that little crease was still hard to get at. Here's a photo with the sun at an extreme angle, so that it really gets shown off. At other angles, it doesn't look as bad.