I have the entire CrpSuite, but have never tried using anything but the MapStat portion. I have two comments about it, and could use additional info if anyone knows.
Mapstat won't do anything on the turn you first load in a game first turn. I think it picks out its info from the autosave and that would start being useful on the second turn, so it might not be at all useful for playing a single turn. I dunno.
Secondly, it seems like MapStat gives you a choice between getting some sort of spoiler info as a setting when you first install it (probably can be changed from one game or turn to another). I can't recall what spoiler info it does give, so you'd have to be on your honor not to use the spoiler preference. (if in fact it even works for a single turn)
Dianthus would probably be the one to ask about those two questions.
I've been wanting to download CivAssistII, but I've noticed in the thread in the Utility Forum that a few people say it makes their computer run a lot slower and sometimes produces strange graphic glitches. I've been waiting for all of these apparent bugs to be resolved, since my machine is 3 years old and not so fast as the newer ones. I have a P4 1.9ghz 512 RAM.
My understanding is that it doesn't give any info you couldn't find manually in-game, but I don't have the patience to do it.
Edited to add: CrpSuite was originally designed for vanilla Civ and includes a module for Ring City Placement, which doesn't even apply to C3C. It isn't spoilerish in this instance...just obsolete.