Progress ...
I had put the basic catapult together, cleaned/filled any seams, etc, and needed to get some paint on, particularly inside the girder assembly, so I did some very light misting of paint (Tamiya rattle-can Haze Gray) from all angles. I first masked off the area on each side where I have to attach more photoetch so I would have a good bond. Looks good and once I get the rest of the parts on, I can do a bit more misting if needed.
I also mounted the lower wing and tail to the fuselage. I have cleaned those parts and the upper wing, drilled a few holes for rigging, etc. I may change plans and mount the main and wingtip floats before painting. And I may paint the top of the upper wing, then mask it, then assemble it & bits/pieces, then just hose down the whole thing. I do not intend to get fancy with alum/metal, silver-dope/fabric - TS-17 does a fine job overall ....