So I'm in the process of trying replace my old oven. After putting the oven in the driveway I was thinking... how this would work as a pellet trap
If you have the solid plates you could install them at a 45 degree angle so the pellets bounce off and down, cuz if you hit the same spot over and over, at least .22 pellets can actually make a hole in 1 mm sheet metal.
I would also do something about acoustics, a pellet hitting a piece of metal are pretty loud, so maybe glue some thick rubber to the back of the deflector plate.
And in the oven have a tub of sorts filled with sand to finally trap the pellets, this will be easy to clean / filter and reuse i would think
Just my 2 cent