Working on some plexy glass today taking the plexy and putting on side of bench you are able to heat up the side of it and then press down on it with piece of wood. This is shown in images below. What I did was took a piece of red plexy bigger than A4 and then measuring in few cm on each side bending over making sides. Then to fill in back and bottom just cut piece of see threw plexy and glued with super glue.
