This paper describes our experiences with closed laboratories in a computer architecture course and highlights the development of a capstone project. We advocate the use of software as a cost effective means of supporting analysis, design, and experimentation. Improvements to the course in regards to content, environment for learning, student perception, skills accomplished and retained, and instructor involvement are outlined. Several labs are summarized, including the capstone project tying together all aspects of machine organization. We conclude that integrating design education into computer science with the logic simulator lab approach is worthy of our continued efforts.