I used to make my own targets back in the 80's but we just stacked cardboard pieces and put a 2x4 on top and bottom with holes drilled in the ends and used rope to pull it tight.
The key was to shoot at the stacked layers not the flat side. No such thing as mckensie back then or memory foam for that matter.
Depending on what you shoot, 9" aint gonna be enough, the foam will probably stop the arrow but not before it hits the backstop. Just use enough foam and no plywood backstop.
Check out "The Block" target pretty cheap and last forever, unless the project is part of the fun.
Chris
The key was to shoot at the stacked layers not the flat side. No such thing as mckensie back then or memory foam for that matter.
Depending on what you shoot, 9" aint gonna be enough, the foam will probably stop the arrow but not before it hits the backstop. Just use enough foam and no plywood backstop.
Check out "The Block" target pretty cheap and last forever, unless the project is part of the fun.
Chris