So last week I finally got around to buying a roll of translucent scaffold sheeting, having finally given up on salvaging any from a building site. It's two metres wide, making it pretty much perfect topcloth size, and reasonably heavy, at 170gsm. We simply unrolled it alongside the boat to get the right length and cut it off in a single section. It's held in place with the standard arrangement of strings, but if this proves insufficient, it has eyelet holes for bungee cord. The idea is to leave it like this for the summer, and then put the black cloths over the top in the winter or if we leave the boat for a while - or whenever we need to look properly historic.
The shaped cloth stays on at the front, and this dark area will be the bedroom.
Now we can clearly see what a lot of work there still is to do inside the hold!