The Exidy list is usually fairly accurate. It’s at mimimum a good starting place. For a non working example of this game to sell for more than 1,000 would be a shock to me.
For comparison, let’s say a working Tempest is 1500. I’ve seen plenty of non working, complete ones on klov for well under 1,000. I would expect similar for this project. If you list it for $750, you may find a buyer on klov. People are expecting projects on klov and on Pinside, it’s more of the opposite with people expecting a fully shoped, and well tested machine when they see a FS listing. Two different worlds.
I do think you would get more for it on klov, just no where close to what you were initially asking. “Games like pinball” are not always well liked on Pinside.