Since there will be requests for tradeoffs, you need to know your bottom line. The board expects that you will understand your project backward and forward and know what is acceptable to your client. It won't look professional for you to try to discuss it with your client at the proceedings or agree to a deal without your client's permission. Your preliminary setting of goals should address this issue. Objections at the meeting.
Most local boards have no formal rules of practice or procedure regarding evidence.
Most boards will listen to all information, and most will not understand the concept of rules of evidence. Also, most proceedings do not allow you to interrupt other speakers and most boards would be offended by this practice. The board anticipates that you will give your presentation and then sit down, allowing others to then make their comments. In almost all instances, especially when you ask, you will be allowed to summarize at the end of the presentation. Usually, that it is the most appropriate time to object.