Hello mates,
I've just noted that both Polikarpov I-15 and I-15bis are under the same 'Topic', despite they are as different as AV-8A and AV-8B, or F/A-18A and F/A-18E, all of them we have as separated topics.
I just created a new theme, I-152, and moved some kits under that, but ... before continuing, what do you think?