Hi everyone,
I have mixed thoughts on this one.
If the 'literary' elements of the thread lend colour and background to the fiction that is the model then I think they should remain within the main thread. The reason being that they, hopefully, contribute to the overarching idea or image that is being created. Several folk on here have done this successfully. Sometimes the whimsy adds value to the model, giving it a greater sense of life.
If, however, the literary element very much stands alone, with its own 'life', separate from the model then, perhaps, a separate sub-forum may be a good thing. Having its own dedicated space may encourage this aspect of the hobby; that would be a good thing.
Many years ago I was a member of a model railway club where one of our members created a great deal of 'literary' back story for his modelling; it had the effect of bringing to life some of what was made. For that alone, the stories were worth having.
Anyway, I'll have a bit more of a think, and then vote.
Regards,
Alex.