Breaking down what you're talking about, if possible on the powerpoint, would be an advantage as far as I can see. Building up the picture with increasing complexity thru the use of different pages? Sounds good! As long as you leave plenty of time for the information to be digested by the pupil that is. This valuable absorbtion time would normally derive from the time it takes you to chalk it out so you will have to add that in which can be the hard part.
Less is often more and the temptation is to waffle when giving a ground brief - bad news for your student! So if you can master the pauses (as important as the words you use) then I personally see no problem, although this is only my view. Think Miles Davis, not Dizzy Gillespie.
Best thing to do is ask your FIC instructor whether this is something that will be acceptable for the ground brief section of your FIC test. In practice on the job it could only be an advantage for you and the student if you ask me. Provided yer fancy pants pooter gear actually works on the day... as the previous poster has mentioned!
VFE.