Thank you Don, N96HBK and Vermin King. Indeed, Johan is a gifted artist and his creations are great.
A bit of progress on the robin. The body is completed now, as well as the tail. I glued a lot of small pieces of scrap paper at the inside of the body to seal any small gaps and to ease the process of smoothing out any joints, resulting in a minimum of visible angles.
The tail consists of two parts, one more or less part of the body and the actual tail. Installing the conical part from the inside of the body is somewhat tricky, as it's difficult to properly press the gluing tabs from the inside, unless you have long and slim fingers. The paper is thin (120 grams A4) and can easily be damaged when applying too much pressure.
After installing the flattened tail, small gaps remain on either side where the two parts meet. With a bit of white glue and massaging the gaps they more or less closed eventually. When dry-fitting the wings however, it appeared that these gaps are covered by the wing tips and hence are not visible. Anyway, that'll be next
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Erik