I have also picked up a new swan a couple of weeks ago, and have stored the annexe walls through the side door under the seat. It fits ok, although it would be good to move my battery hard up against far side to make better use of the space.
Sorry to hijack the thread, but we also have a weber q, and I am wondering where people store theirs? I cuurently have it stored in the front boot, but am looking for other options.