First basic model of the pusher tug completed.

I’ve processed all the ideas and am happy with the initial design. Are any details missing, or have I forgotten anything? Except for the bathroom, the furnishings are interchangeable. The connection to the lighter (barge) works using tow balls. If my calculations are correct, the stability should allow for pushing two barges in a row, or four empty ones in a 2x2 configuration. I’ve built a physical prototype of the connection, though I haven't decided on the final implementation yet. Right...