I bought a truck off BaT back in 2017 before it went mainstream, positive experience, would do it again.
I think if you cant agree on reserve price they wont list it. I believe they tell you what the reserve should be, and you have a little wiggle room. Knew someone who had to have a lower reserve because thats what BaT required. Fortunately it sold above what he originally wanted so it worked out in that case, but for a project in pieces dont think it will.
If its a vehicle with emotion tied to it, or alot of work that isnt easy to tell from photos or no receipts, will be hard sell unless no reserve.
BaT is very different now than it was when it was truly bring a trailer to grab the project you just won. I would list a nice square on there but not a project. Most on there want turn key these days.