A window buck/drywall panel assembly comprising a window buck having a cross-section where the cross-section defines a right trapezoid, where the window buck includes a window buck beveled edge; and a drywall panel having a cross-section where the cross-section defines a right trapezoid, where the drywall panel includes a drywall beveled edge, and the window buck and the drywall panel are secured to one another such that the window buck beveled edge and the drywall beveled edge are in contact with one another.