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Coming from my teams experience in already having made a tube, you should heat the plastic, drape it over a cardboard concrete form of appropriate size (available at homedepot) while it is still soft to form half of the tube. make two of these. you can do this in basically any oven that is big enough. our school happened to have an oven that hadnt been used in probably 20+ years but still worked great! after you have the two halves cut two 1 inch wide strips that are the same height then use these to glue the two halves together with polycarb or abs or whatever kind of plastic you are using glue. you also can do it with out heating the plastic and just have it be flexed but it is much more difficult to do. if you do heat, set the oven at about 300 degrees F and put the tube and plastic in the oven for about 4 minutes or until the plastic drapes over the tube. its safe to put one of these cardboard tubes in the oven but build a rack for it so it doesnt roll around.