To close up modified forward side of air filter tray, previous layup scraps were cut and reassembled into a thin, straight composite board. Front composite layers were prepped and filled with flox; board was clamped onto the flox on the forward side edges to cure. Refitted left front baffle and snorkel to engine. Began work on filter bypass door; this will be preassembled, but it has been suggested by reputable sources that it need not be installed at this stage.