Recreating the lost episodes of The Celestial Toymaker

In a recent blog I made the case to remake missing Season One adventure Marco Polo using a brand new cast. Since that post, I began to ponder what other stories could be recreated using a new cast to re-shoot the lost content. Considering every story currently lacking an animation will take some time, given that one must necessary weigh up some very important questions: how many cast members would you need? Does the story feature location shots? How long is it? Some stories will obviously be much easier than others to reproduce.