OpenGL Skybox for X-Plane 10

I want to implement an opengl skybox into X-plane 10 using the plugin SDK here : [login to view URL] I need to be able to pick 3 or 4 different skybox textures in the GUI for the plugin and the Skybox itself needs a transparency. For testing and debugging you can download the X-Plane 10 demo here: [login to view URL] I will do the graphic design work on the individual skyboxes and the plugin after a compile will need to point to a specific folder where I can edit the files..... If possible I need the plugin compiled for both Windows and MAC, but Windows being the priority....