The units for this modular are easy to fold. The assembly is an interesting process with a somewhat unique lock. The completed model is strong and can be either convex or concave, depending on preference. Each result looks quite different from the other. Students will be given diagrams and I will be available for assistance. I can fold this 30 unit modular in 45 minutes. However, some people may take longer than that, and thus may not be able to complete it in class.