I finished my 2nd cardboard target.Just folded the bottoms out flat and stacked them up about 36in high and then put a piece of board on the top and bottom then ran a rachet strap around it and cranked it down tight.For the dots I just cut a template out of cardboard and spray painted over it.55 pounds penetrates about 8-10 inches at 30 yards.It is a little on the heavy side at about 25-30 pounds.However the weight seems to help keep it from rocking back and forth when the arrow hits.
Nice, I was thinking about doing this and making some weather protection for it so I did not have to bring it inside