The Energon Pub

Looking some advice form you expierienced customizers. I'm about to start on my first project, converting a TFU Sunstreaker into Wheeljack. I'm comfortable with the painting, but I'd like to modify the existing head. I wound like to remove Streaker's "ears" and replace them with some that obviously resemble Wheeljack's. What type of material should I use to create these? I also need to create the mouth area. All sugestions welcome .