Step 4Assemble Core
iImage Information

Assemble the core by attaching the middle sections together. WARNING most glue will melt the foam. Fortunately, plain old Elmers glue works great. I also used 3 drywall screws to hold the pieces together as the glue dries. Makes sure you allow at least 24 hours for the glue to dry. If you want you can install a construction helmet (as a very nice head support) and ventilation fans. For ventilation fans I used old PC fans connected to 9 volt batteries (sorry I dont have a picture but you can see the holes for the fans). Make sure that it fits and is comfortable before going to final assembly.
To help adhesion, roughen up the surface of the plastic helmet with a fine to medium grit sandpaper. This should help the glue stick to plastic. You are looking to remove the "gloss" of the plastic. You want to make sure the glue doesn't just "slip off" the smooth surface.
but thanks ^^