Although the shapes of these models are quite simple, the technical challenge of reproducing their adhesive material was not.  We needed to achieve the proper look and feel of each, at a much larger scale than actual.  We also needed to precisely replicate the rigidity or flexibility of the adhesives when pressure or multidirectional movement was applied to the top piece.  Though we are experts in these materials, simulating their various properties was a chemistry lesson, indeed.  The transport box in the background is made of Gatorfoam (foam sheets “skinned” in hard plastic), making it lightweight and durable.  We typically build these to conceal and transport our models.