I did a little minor sanding on the fit between the lower cowl and the firewall flange and then finished sanding the horizontal joint in the lower cowl until it is perfectly straight on both sides. I think the lower cowl is pretty close to how I want it now. I will still need to do some adjustment around the inlets, but that can wait until the top and bottom halves are mated so that I can do it off the plane.
I hear so many builders complain that they hate working with fiberglass, but I’m really digging it. There is a certain freedom that comes with knowing that you can repair almost anything. If a part is too long, trim it. If it’s too short, add back some material. If two parts don’t align, you can reshape it easily. Done properly, any repairs can be just as strong as the rest of the material.