As Steve says, you don’t need to declare your markings. This is only the feeler, so for now you just need to say your interested in joining. Once the actual GB thread starts, the host will post a roster of thpose taking part and the kit they are building. The main thing for now is not to start building the kit until the GB starts, in this case jan.
I started a thread last year to help new members with GB’s as many were asking, hopefully you might find it useful.
http://cs.finescale.com/fsm/modeling_subjects/f/29/t/154045.aspx