The extensive relaunch involved numerous large redesigns and a reboot of the franchise's universe. Each model featured interior redesigns, minor mechanical improvements and minor exterior changes. The series has undergone several major redesigns. Several characters underwent complete redesigns and name changes. The M77 has undergone one minor and two major redesigns. Examples of realist typefaces include Baskerville, Times Roman, and other contemporary redesigns of traditional faces. Oddsock and Swoop's designs were thought of early on and required no major redesigns. Several significant redesigns and extensions have been built. Criticism focused on the characters' redesigns and the changes to their personalities. As the hanbok continues to modernize, opinions are divided on the redesigns. Work started in January 2004, but archaeological finds caused delays and required station redesigns. The SRBs underwent several redesigns throughout the program's lifetime. Technical issues existed in the concept which delayed development, forcing redesigns and re-engineering. In addition to redesigns, new shapes were added to the line. Extensive redesigns were made for the M1918 model.