Finally some progress to post. Christmas and New Year were busy, as usual, but I got back to things last week.
I reached the point where I could mask windows and do some preliminary painting before fitting the sub-assemblies together.
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Assembly turned up some "issues." The cockpt canopy is too wide for the fuselage, and protrudes somewhat at each side. Since there is no good way I can think of to fix it, that's the way it will have to be. The gun mount windows in the nose do not sit quite flush with the fuselage. So I will live with this too. Neither does the radio room gun window, but the problem here was the locator tabs in the fuselage being either placed too high or being too thick. By the time I discovered this, it was beyond fixing on this kit--but I did sand them down on my second build, and I think this will allow the window to settle in better.
In fact, most of the parts in this kit just don't fit well without some sanding to reduce them to proper size. The same is true for the tail gun mount. The gun piece wouldn't fit in the opening without a bit of shaping with an emery board.
Both Fortresses I'm working on had de-icer boots removed or worn away, so these will appear in natural metal. For NMF, I've always had good results using Floquil's RR paints in various silverish configurations (old silver, bright silver, platinum mist). They all go on relatively smoothly, and produce a pretty durable finish that can stand up to masking tape once the paint is fully cured. And I will be waiting 10 days to two weeks before I attempt to mask the NMF areas and get on with assembly. But, nothing is ever certain in modeling, and I have encountered paint lift with the Floquil family of silvers, even after two weeks of curing. Building models is often so much like gambling.
I dislike using filler and having to sand said-places smooth, especially with clear plastic, so the canopies and nose gun mounts were attached with white glue, then thinned white glue was run in with a tiny paint brush to fill the seams. When dry, a couple of swipes with a q-tip (or is it a "cotton bud?"), and the overage washes off. The technique was written up in FSM ages ago.
I did use superglue for the fuselage windows and 3-piece waist gun windows (vacu-formed, by Squadron). The latter took some attention and effort to sand of the excess, and after I took these photos I did a little more smoothing on them. I think they will look OK after the final paint.
I've been enjoying seeing everyone else's progress. There is much 3-D art being produced here.