There needs to be some sort of incentive to fill in the diary, otherwise, after a game or two, it's a novelty that probably won't be bothered with. I like it, but if you're playing many games, it's not a priority. An incentive of some kind, even just something very small, would help.
Also, message on previous actions for the tower, if unmanned, says "well" rather than tower (or it does in one of the games anyway) was unmanned.