Under the Uniform Commercial Code,(UCC) generally an offer to sell and an offer to buy are all that is needed to show that a contract was made. If one of the parties reneges, it would be a breach.
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.