What’s the length of the ailerons and flaps? The manual says you need a 2x8 foot perfectly flat bench. I’m just wondering if it’s truly 8 feet, or if they just said that out of convenience of cutting an MDF panel in half. My workbenches can be pushed together to be 8 feet long, but they wouldn’t be perfectly flat because of the joint between them. I was thinking of grabbing a free hollow core door on Craigslist for a bench top, specifically for building the ailerons and flaps. Doors are not 8’. Would that work, or do I need to go grab MDF? My experience is the doors tend to be just as flat, if not flatter, than most 2x8 stock.