We used to make "show tanks" that could be disassembled and reassembled at fish shows out of plywood and pond liner.
The tank's bottom and sides were joined with wingnuts (wings on the outside). Then, felt (like what's used on pool tables) was laid over the inside of the wood case and over the boltheads. The liner was then fitted into place and folded over at the seams. We had to adjust the liner as needed to line up the hole cut in the front for the plexiglass window. Then the hard part came of getting the bolts through the liner with a thick rubber washer at the bolthead, then through a custom cut rubber gasket, the plexiglass, and the wood frame. There was a bolt every 1 to 1.5". Then the wingnuts were tightened on tight enough to form a seal at the washer/liner/gasket. 2 people had to shape and cinch the liner as the tank filled. Sometimes there was a drip or two but, these tanks held well enough for a 2 day duration the shows usually lasted. Of course, nowadays, acrylic tanks are used to display large fish at shows. Back when we used plywood collapseable tanks, we used them because our large steel framed slate-bottom glass tanks were just too heavy to be able to use them for the shows.