Could someone make a simple 6' wide x 6' tall x 1' deep white box with this in the middle front of it?

I'm making a training map for our clan and I've made a rifle range, now we'd like something realistic to shoot at. I need it to register bullet marks obviously.
I'm still trying to figure out how to make objects. If you have experience, you could probably just whip it up pretty quick for me.
Thanks ahead for any help!

I'm making a training map for our clan and I've made a rifle range, now we'd like something realistic to shoot at. I need it to register bullet marks obviously.
I'm still trying to figure out how to make objects. If you have experience, you could probably just whip it up pretty quick for me.
Thanks ahead for any help!
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