The demo questions are best answered by Greco @ SBOL who would be providing them to you. Email him at info@skiboardsonline.com . And if you really want to try a lot of boards try to connect with other riders in your area or at one of the events like ShredFest.
Chamfering is cutting back the top sheet and sidewall materail. You are essentially knocking the corner off the top edge of the sidewall. To prevent and delamination of the layers when doing this I suggest that you file the edge with a downward stroke only not an up and down sawing motion. This will prevent the file from catching the top sheet, lifting it, and creating any "gaps".