That foam is fairly dense, and the clear film covering must be removed before use. It won't laminate with it on there, and it will make a mess anywhere it reaches the OML. I know a guy that makes all his planes out of foam, and they are all way too heavy for 3D. 3D models are basically monokote stretched over the minimum amount of structure required to make the appropriate shape, while providing the minimum amount of strength required for the extreme flight loads achieved in 3D flight. In other words, won't really work that well, especially the larger you go.