Try filling the plastic pieces with "One Time" light weight spackle. After it drys cut out the parts. The dry spackle gives you a lot of surface area to glue to.[img][img]http://i770.photobucket.com/albums/xx341/wmikedavis/DSC03669.jpg[/img][/img][img][img][img]http://i770.photobucket.com/albums/xx341/wmikedavis/nieuportfinalpictures004.jpg[/img][/img][img][img]http://i770.photobucket.com/albums/xx341/wmikedavis/nieuportfinalpictures006.jpg[/img][/img]
[/img][img][img][img]http://i770.photobucket.com/albums/xx341/wmikedavis/Nieuportcocpit002.jpg[/img][/img][/img]
Here is a seat I made from an old playing card, balsa for the base, some leather from an old wallet, and some wire insulation
[img][img]http://i770.photobucket.com/albums/xx341/wmikedavis/Nieuportcocpit005.jpg[/img][/img]