Billy said, "I've been told they would be fine up to 200 Degrees F. If it gets that hot, I think we have bigger problems, but it may get up to 115-120."
Billy, who ever told you that must not know how hot 200 degrees is!.If you want to do a little experiment, take an old unwanted body, or better yet, take your most prized possession and put it on a cookie sheet.Set your oven for 200 degrees and slide it in when the temp is at 200.Just let is set there all day long and see what you get.
Now I'm not Bill Nye "The Science Guy" or Mr. Wizard, but 200 degrees is 200 degrees whether it's in an oven or in some HOT storage building.You would most likely end up with warped bodies and chassis.
I don't trust the heat and I won't even store my kits in even 90+ temps.
I don't see a problem with the cold though.It can't change the shape of the bodies like high heat can.
RowdyYates