Placement on the ground
When placed on the ground, the target will need to be able to take a hit. To handle that, it will need to be supported from the back, which I will accomplish by having a strong piece in the back that it can "lean" against. In order to make it easy to store, carry and setup, I will have the backing attach to the front with a hinge so that the back can swing in and out. Additionally, I will use a wire on the bottom to keep the back from swinging way to far out and to ensure it is easy to setup the target at a good angle (too small an angle will make it weak if hit high).
Placement inside a goal
The target needs to be easy to setup inside a goal. People will want the target in side the goals because the goal will block the ball when the children miss the target making it easy to collect balls after all the shots are taken. In order to do this, I thought it might make sense to attach "eye screws" to each corner. by doing this, I can quickly experiment with different kinds of materials for attaching the target...bunji cords, rope, luggage straps, etc. I want to do this testing because I am not sure of how much "give" the target will need to have when taking a hit. If too stuff, it might cause too much "shock" to the system. If too loose, it will give too much and much of the force of the hit will be lost.