That looks nice Intenseaty22 - the handle is a classy touch as well. I get large rectangular plastic detergent buckets from a friend who runs a kennel. I guess they are maybe 15 to 16 inches tall. I fill these with rubber mulch and use cardboard taped on the the top/target board. I’ve fired a .45 caliber Dragon Claw (?) into it a couple of times and it stopped the bullet. The rectangular shape makes it easy to position. I do some woodwork and may have to copy your design though; it looks pretty cool.