Hey Chris, pretty impressive, I like it. 6g for ducts seems pretty light. Composites are tough to make much lighter. As far as deleting or editing photos, go to edit, at bottom click on 'Go Advanced', and then you scrol down and click on 'Manage Attachments'.
I do wish you best of luck forming the 2mm Depron. It is a real challange for me still unless everything is gentle and smooth transitions. Looking forward to more. Looks so clean and real nice already! Keep the pictures coming it makes for a so much better presentaion and we all love the photos!