Closing in roof

How would you close in this roof without bringing the ceiling height lower? The colourbond gets mouldy and we spray painted it and needs to be resprayed but it would be nice to have a set ceiling with down lights but it will obviously make the ceiling feel very low. Anyone good any good alternatives?

How would you close in this roof without bringing the ceiling height lower? The colourbond gets mouldy and we spray painted it and needs to be resprayed but it would be nice to have a set ceiling with down lights but it will obviously make the ceiling feel very low. Anyone good any good alternatives?