You could do the nesting of the parts for more efficient material usage. I made individual components for the rectangle and triangles so they can be rearranged any way you want. I might use SketchUp and LayOut to get an idea of how to nest the parts for efficiency but I’d probably make patterns from plywood because I’m thinking that you might want to shift things slightly to get the pieces to mate nicely since you have no supporting frame structure to tack these to.
A couple of notes about your modeling. First you should be staying on top of face orientation. Only white faces out. Second, for a project this size, Architectural units especially with precision of 1/16 in. isn’t really appropriate. Either use Fractional or Decimal and increase the precision to higher than you would use in the shop.