I'm arriving at CDG 09:25 but not catching the TGV till 13:52. Having tried to negotiate the gerbil ramps before I would appreciate tips on how to get thru customs and then to a *A lounge. Since I will only have carry-on can I do an "in transit", stay within the secure area, and make it to a lounge? Are there showers? Ideas on how to kill 4 hours at CDG?