[Q]

I'm not sure if I understood your question correctely. It's no problem to limit the size of the shpis because there are lower and upper limits for the size in the design instruction. But the problem is, that if you have different sizes of the same ship type the AI will use all he can. It is not possible until now the tell the AI to stop using a ship design for small ships once he researched larger ships. Was that your question??