Here is a reddit article written by u/TonyRealm which i would recommend everyone to read. This not only to re-design your base when you feel like it is needed. But to start understanding the base designs of others as well. It will also change the way you may be thinking about how to raid a certain base in clan wars.
http://www.reddit.com/r/ClashOfClans/comments/2xxxad/warstrategy_th9_war_base_design_indepth_guide/
http://www.reddit.com/r/ClashOfClans/comments/2xxxad/warstrategy_th9_war_base_design_indepth_guide/