Roller Coaster Box

We just scored a whole lot of free top sheet material. I dont know exactly what kind it is, but its good stuff and pretty bendy, so we are going to try to build a roller coaster box. Anyone ever made one. Got any suggestions? What should we use for coping? Please give me some input, I wanna do this right.
 
^ also, how did you attach the top sheet, and how did you get the seperate sheets to run flush together....oh, and how long is it?
 
it was 6 inches wide, i attached the topsheet by pre-drilling holes about halfway through the HDPE, then used 1 and a 1/2 inch screws to screw it on, and to get the sheets flush i just lined the up the sheets and screwed them down thight, but also rubbed the edge with my ski edge to get rid of the corner if it was a problem, and its 16 feet long, if you have any other questions just ask
 
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