Thanks to all who left comments, much appreciated!
I didn't have a day off today, but my flights are at 10:45 tonight so I basically had the day to myself!
I drilled the holes in the fuselage for the elevator and rudder cables, and also for the upper centre section bracing. Unusually, this aircraft doesn't have cross bracing fore-and-aft between the cabane struts, only side-to-side. The fore-and-aft bracing is forward to the front of the engine and aft to between the cockpits, so those holes have also been drilled. I then fitted small pieces of brass rod to the cabane strut holes in the upper wing centre section, and when those were dry, I added the struts. Here's the first dry-fit of the centre section:


I also painted the floats..... again! I'm a lot happier with the finish this time, and I think one more coat of clear orange may well see them done.

I will make a few small adjustments to the cabane struts, cover the brass rod joints with dissolved putty, then paint them before fitting the centre section. Rigging will be added as part of the attachment process rather than after it's all done as I want to make sure it will add structural strength.
Thanks for looking in!
Ian