Builds are where an instructor-led building project for a group of people who individually complete the same project. At the MegaMini "builds" are offered to teach attendees the best-practices method of constructing a project, i.e. controller enclosure, P5 panels, etc. There is a cost to attend a build, however it is usually less than the cost of purchasing the materials separately as the individual is participating in a bulk purchase opportunity. Additionally, all of the items needed to complete the project are in one kit and taught by an expert. At the completion of a build, usually two hours, you will have completed the project. It allows the inexperienced DIYer to complete a project in an expert manner.