When it comes to free tips, the chain of evidence is usually the other way around. I would have said take it or leave it, but you yourself already said that you are not receptive to hints. So, good luck further, it certainly won't collapse, just a house with construction defects among many.
That doesn’t have to happen, but the risk does exist. Hopefully, there is still money left over to compensate for the same mistakes afterwards at a multiple of the costs. But at least the construction sum remains nicely low.