Hello Mario
I confirm that it's quite easy to mate the Attacus atlas naturally if you get space, heating, and linear wind ventilation. In my butterfly Garden at Honfleur in Normandy, France, I regularly obtain the maintings. Remember also: it's better to place the new hatched female at the top of a high branch near the source of ventilation in the morning so that she is very quiet at night. It's better to keep the males outside the greenhouse during the daytime and to introduce them late in the afternoon. So that they are not maintained in the parfume of the female all day and are very exited once the female start attraction.
It's a real pleasure to see the males flying at sunfall looking for the female. They fly so well...