Every square inch of that barn will be covered in Playmobil before long, and you’re going to be building extensions and add-ons just to house extensions and add ons… Been there and done that I have…
But since done is done, ¿would you listen to some bad but well meant advice? Many years ago I had pretty much all my toys in a barn. Then one night it caught fire. The water to the barn didn’t work and there wasn’t sprinklers. Had we installed sprinklers and working water, the building would have been saved AND the contents, less a little water related discoloration, would have been none the worse for wear.