It is one big sheet. I used welder to bond the pond liner to the glass and the 3M 2500 in the corner between the glass and pound liner. there will be creases in the corners of the tank that will not look vary nice but it was worth keeping the pond liner one peace. I glued the glass to the pond liner while it was on the ground then lifted the glass and pond liner up into the tank. I have a link to ware I got the pond liner in earlier posts. like I said at the start of the thread the goal was to be able to take the tank apart and get it out of the house with out cutting anything. I estimate that if the tank was empty it would only take two people an hour to take it apart and load every ting on a trailer.