Started to install the sidewall upholstery panels. The righthand panel did not sit very well around the forward door latch cutout. I knew in time I would catch the panel getting in and out of the aircraft and damage the upholstery. I decided to remove the panel and install two more rivnuts, forward and aft of the latch cutout, which will ensure the upholstery is secure on the sidewall. I have the righthand side panel installed, tomorrow I will install the lefthand side panel.