Nice very temporary backstop. As soon as you make it several feet thicker, it should be good. As soon as you shoot the bullseye out engough, you will bore a tunnel right through your backstop. Then you will have rounds down range and be a serious safety hazard.
Your green target is WAY TOO CLOSE to the top of your backstop.
You do not want to use that for classes. I don't know what sort of classes you are giving, but I highly doubt it would qualify for a Texas CHL range.
"If you look through your scope and see your shoe, aim higher."
-- said to me by my 11 year old daughter before going out for hogs 8/13/2011