Well, I see the RB Model website is back up, although my order is still listed as 'soon will be sent' as it has been since the order went in, and there has been no response to my email chase (I would phone, but the call would cost more than the items!).
So I ordered the nav lights from Dean Marine, they arrived next day (more expensive, but available!). And the result is a little TID Tug at 1/72 she's only 29cm long. And yes, there are some errors (the steps on the coach-house are too far aft). But she was such great fun to build, which is what it's all about, right????
But this is what she looks like on a trial in the sink