I have installed a fourth pair of head timbers and overlays on them, which close the grooves with regels. The overlays are made of a pear rail 0.5 mm thick. On the inside, in the overlays, I had to make small grooves, as the regels protrude a little beyond the head timbers. I like the combination of the color of natural wood and blue decor, for example, on the Charles Middleton model, and I try to use this scheme at home. On that model, these overlays are profiled and the middle part is blue. But on my model, the width of these overlays is less than two millimeters, and it's difficult to attach the tape to the edges. The paint job isn't very neat, and I'm thinking about applying thin strips around the perimeter, leaving the middle part blue. This will add extra volume and hide any imperfections at the color boundary. However, on such a small scale, it might be better to leave it as it is, especially since there's still a lot of work to be done.
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