Pre-drilled both side skins to cabin floor skins. Then drilled to size for A4 rivits. Drilled part # 6B8-2 to part # 6B8-7 and drilled 5/8" holefor part # 6G2-2 for nose wheel strut bungie. *** NOTE: Bungie will not fit behind part # 6G2-2. the space between 6G2-2 and firewall is about 3mm too narrow for bungie. Will contact Zenith for solution and/or new parts.