This is very simple. If you are about to enter into contract to have a yacht built and wish to have a surveyor monitor and apply controls to the process, please don't sign the contract until your surveyor and marine solicitor have read it.
The contract presented to you by the sales team may mention that your representative may visit the yacht while it's being built and at certain intervals, but it probably won't define what powers or authority that he may have.
Too often a concerned owner has called me in, to exert influence on the building of his new yacht, but if I am allocated no authority within the contract, this will significantly dilute what I can achieve on the owner's behalf.