HARS is a fabulous museum. The Southern Cross replica must be all but completed by now. The place is staffed mainly by enthusiastic volunteers who, going by my experience, are as generous with time and knowledge as you'd like. Having such a comprehensive collection within reach of most on the Eastern seaboard is a winner.
I think that the siting of the original Southern Cross in a somewhat distant and uninspiring building kilometers from either the domestic and international terminals is disgraceful and I started a thread on the topic here some years ago. Lindberg acknowledged that the trans-Pacific crossing by Kingsford-Smith et al was a greater feat than his Atlantic crossing. The Spirit holds pride of place in the Smithsonian in Washington whilst the old bus is existing, Cinderella like, in a shabby warehouse. Shame!