Fabulous! I especially like the way you presented the information.
Insulbrite is a bit pricey and because you wouldn't really be worried about ruining ply-wood - it likely is not a necessary step.
It does, however, work (insulbrite) in the same fashion as described when you DO want to protect what is underneath - I did it and was very pleased when I hadn't ruined my table, afterall!
If you are unfamiliar with insulbrite and what it does - think ovenmitt/potholder insides!