Nice set up there Durgesh.
Kudos on re-purposing stuff that was around to make a nice pellet trap. That's a nice setup. Similar to what I have. I made mine out of an old plastic crate that allowed me to press a 12"x12" piece of plate straight into the bottom. I usually change the cardboard up front when I change targets so wear up front was not a problem. The problem is, I've been making carboard pieces 8/12" x 11" to match my printed pages, and making taping the targets up oh so easy, not 12"x12" to match the opening. Now that I'm inside shooting at slightly over 10 yards, the back splatter is coming out. So, I'll be trimming my new target backing pieces 12"x12". My catch pan is a purchased duct cap piece. works real well.
This is what I am currently using. The little breath mints container is relatively thin and easy to handle in the woods. The orange stuff inside is microfiber towel material held in place with rubber cement. I usually carry about 20 extra pellets when hunting.Very QUIET!