I've put it off as long as possible... it's a bit fiddly, but so far so good. The bent rod connecting the square runs to the cranks idea has proved rather more durable than I thought for just a plain soldered joint - that bit's been putting me off, I admit it! So, some Plastruct square rod has gone under the rails (to ensure no short circuits) and the rest dropped into it's respective stools. I still managed to miss one out... Basically I super-glued the end to the crank, let it go off and then put the rod in the rest of it's stools, a blob of super-glue on each stool to make sure things stay where they are intended. Team P&D (panting and decorating) will be along when all is done.