Thanks for bringing this up.
Yes, it is immensely important to work on the Chairman's Award presentation. The Fix-it-window idea applies to technical aspects of the robotics process. There is no window on the presentation, since obviously you can't resubmit a new award after the deadline. Try to spend time creating a fluid and practical presentation. The first 5 minutes (as mentioned in the awards manual) are presentation time, where as the 2nd 5 minutes seem to be Judges ask questions time. Prepare your committee of three with care. Possiblities:
1) The primary student who worked on the Chairman's, if there is such a thing.
2) An exemplary leader from the more technical side of the team, so that they can present answers to questions that may simply apply to them more personally, or that they're much more knowledgeable about.
3) An advisor/coach such as yourself.
4) Another chairman's award writing student.
5) Another different type of student (i.e., a rookie or someone)
Good luck with your presentation!