When looking at all the instrument boxes that need to be installed behind the panel and sub panel access becomed a problem. The only way to get to anything behind the panel is from underneath. Super pain and very hard. The decision was made to cut two doors in the front top skin that can be removed and most all of the instruments accessed from on top. Friend Don and I spent two full days cutting, dimpling, riveting to get the doors complete. Will payoff in the future.