Yes. The Duke has learned the hard way that his architects’ guesses as to how much their projects will end up costing are consistently worse than useless; if you want to optimize on cost as well as impossibility, that’s another thing you’ll have to deduce from the record of finished projects.
Response to clarifying question:
Yes. The Duke has learned the hard way that his architects’ guesses as to how much their projects will end up costing are consistently worse than useless; if you want to optimize on cost as well as impossibility, that’s another thing you’ll have to deduce from the record of finished projects.