I picked up an older Clam portable house (a 4 holer) from the trash a few years ago. All of the poles and the cnavas were in good shape. I had all of the seams redone at a shoe repair ($20), but the floor needs some work. The previous owen had used plywood underlayment, but that had of course rotted out. I was thinking of using plastic paneling (the kind used for bath tubs) and then putting some non-slip tape on the floor. Will this work? or is there a better way. The house has 4 "holes" (two sets of two squares at oppsite sides) and a ribbed floor. I am looking to keep the totoal cost and weight as low as possible. Thanks for the help.