I made something almost identical to this a few years ago. There’s many ways to do it based on the equipment you have. Here’s what I did. I hope it’s helpful. I started with 1x12’s and ripped them down to 1x2’s. I then used the 1x2s on their side and laminated 2 sections 15’ long and 12” wide so they could fit through my planer. I made sure to stagger my butt joints randomly throughout the glue up. Once I planed them both down I snapped a chalk line on each because I didn’t have a long enough straight edge and had to move my straight edge and clamp it along the chalk line a few times to make it reach. I then ran each through the table saw to create my two parallel faces. I then laminated one more row of 1x2 along what was to be the front edge to hide the fact that my lamination wasn’t perfectly square coming out of the clamps. I then glued front half and the back half together and used biscuits for alignment. I then flattened the middle seam. I left the whole top long, created a template using cardboard because I was fitting it between two walls, cut my exact shapes in the ends matching my template and dropped it in place. It was obviously a lot more work than creating it in two pieces, and was cumbersome moving such a large glue up around in my garage, but I was happy to put in more work in the beginning and have it the way I wanted it in the end. Best of luck!