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The frame for the cabinet consists of 2x4s that are measured and marked at the determined length, then cut on a compound miter saw.
Mark the width of the side panels on 3/4" plywood and draw a line with a straight edge (Image 2).
Cut the plywood with a corded circular saw (Image 1). The thickness of the wood makes this too big of a job for the cordless saw.
The panels can then be cut to height on the miter saw.
Determine the center point of the cabinet on the wall, then mark the end panel locations. Use a level to draw a straight line, then attach the end studs to the wall.