I have seen a couple that I like. I saw one guy with 2 sawhorses and a 3" thick , solid wooden door from like a school or a public building. That was awesome. He's had it for years and not sure where he got it. I looked all over for a solid door. I have also been told a nicer hollow door from Lowes can be had for $50 or so, then I would just put that on the saw horses. I really want to make sure the kit is square and straight. If I am building a $4500 aircraft, I want it to have a straight and true platform. I also plumb-bob my surfaces... I am a little overkill yes... LOL