Have you considered the possibility that the developer is in financial trouble and is cutting costs on 'details' like detailed plans and senior engineers in the hope that the trades will know what to do?
To me, something smells very fishy about the scenario you've painted. Make sure you don't end up as a creditor if/when they go bust.
Also, I wouldn't rely on the "I was only following orders" defence (post 4) without checking with a lawyer firsr. You may have the moral high ground, but it'll still be a system that you installed that is not fit for its intended purposes, which is potentially going to lead to years of hassle.
To me, something smells very fishy about the scenario you've painted. Make sure you don't end up as a creditor if/when they go bust.
Also, I wouldn't rely on the "I was only following orders" defence (post 4) without checking with a lawyer firsr. You may have the moral high ground, but it'll still be a system that you installed that is not fit for its intended purposes, which is potentially going to lead to years of hassle.