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bughunter
You can add a new topic on your own, by adding a kit for it. Only empty topics are auto-deleted.

Alex K
Sure, dear Frank, but I can't add a topic if there is NO kit available - but there are, instead, a number of interesting gallery articles for scratch-built models of said subject... like in this case:

scalemodels.ru/artic..ovskijj-bich-22.html

bughunter
Then I would add a gallery article and edit it afterwards. There is also a topic field.

Alex K
Unless I'm terribly mistaken (and apologies if I do), you can NOT add a NEW topic by using the topic field on the edit form of gallery articles... (as is the case with new kits). The same also used to apply for new entry books, again if I'm not mistaken...
See, for instance, always in the case above: scalemates.com/articles/article.php?id=437176&m=edit
The topic field in the "edit gallery article" form in fact only allows you to select from a pre-existing list of topics - if you simply write the name of the new topic, the topic still "doesn't exist" - unlike what happens when you enter a kit for a new topic...