I too think you have a good chance of winning by showing there clearly was a breach of contract, but you can't prove any damages so likely your award would be .........ONE DOLLAR.
You would make your point but would lose your ass in attorney fees.
The concrete work cost is not a damage as if the machine did not pass your inspection then you would be withdrawing and still have spent that money. You also still have the concrete work to use. So no proven damages there.
The court would infer that the machine was contracted for a fair market price so you can still buy another one at fair market price. So no proven damages there.
Any lost profit is speculative as machinists do sometimes lose money on an order. So no proven damages there.
Since you can prove no damages a lawsuit would just be pissing money into an attorney's pocket.
Damages in breach of contract could be calculated as the total value of the contract to the plaintiff.
The value of the pad that was installed would be one measure of his change of position based on his belief that the seller would complete the sale and delivery and not go into breach.
Fair market value has little to do with the matter, since there was a meeting of the minds on the value of the machine.
To say that there would be no damages is going a bit too far. It is of course problematical to start a lawsuit since it is a lot of work in discovery, depositions and the like, yet people do it on a daily basis and the courts are overflowing.
Resell can also cite Libel and slander for this whole thread and take OP to court....