your building a shadowbox. I'd switch to using 1' x 4" Select Poplar. You should make the edges at least 4 inches larger than the perimeter of the screen. You can then apply Black Velvet as a surroundin the back of the box. Use heavy duty Corner "Flat L" Corner brackets on the inside edges of the 1" x 4"s and the Box's Panel backing.
I guess you talking about a Mfg screen.
Get out of here.

I guess you talking about a Mfg screen.
Get out of here.