If you choose to make your own panels then you should consider attaching them to the frame using "panel" screws. These screws are very long and you might be able to unscrew the panel when you need to move your building.
As for making your own panels, you should take the advice above and contact them. Making a panel sounds easy but if you don't reproduce the environment needed for making them correctly, as in right temperature, right pressure, right glue, then you could have some problems with them.
Good luck and let us know how you make out.
Jim

Whatever you do, have fun doing it!