It is sufficient.
The obligatory precaution demands that infidels be prevented from entering mosques except when they intend to research about Islam and like that.
Performing these acts in the mosque is not prohibited and there is no need for the permission of the religious authority. However, attending to worldly acts in the mosque is considered to be makrūh and if these acts disturb the worshippers in the mosque they are prohibited.
If rows of women are behind men there is no need for a curtain but if they are beside each other the obligatory precaution demands that a curtain separates them.
There is no problem with it if the mosque is not decorated with gold and the picture of living creatures and on the condition that it does not lead to extravagance and the wasting of resources.