Don't kill yourself about going back to review Part I - Part III is really more of a check to ensure that you are the person who did the Part II you submitted. It's going to be four essay questions regarding facets of your project that you'd only really know from having been the one to do the design work. The best preparation you can do for the exam is to go back over whatever notes you made when you were doing the project, to review the project itself, and just know it backwards and forwards (and why you made the choices you did).
Theodore Jonathan Casser
SCJP/SCSNI/SCBCD/SCWCD/SCDJWS/SCMAD/SCEA/MCTS/MCPD... and so many more letters than you can shake a stick at!