I like the design very much as it reminds me of a similar layout I was involved with some years ago which had plenty of operational potential. One question regarding the barge. Will it a permanent fixture or moveable? Ours was in O gauge so it had to be fixed due to the sheer bulk. In S gauge, if it is light enough, there could be a spare unit so that they would be the equivalent of cassettes in a staging yard. Looking forward to following the construction.
Ken