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I don't know if you have considered it, but you will have trouble with keeping track and other things tacked down to the plywood if you don't have anything to keep it from flexing. I would recommend you consider using 1X3 or 1X4 framing on the underside of the plywood to help make it a rigid table. By doing this, you could use 1/2" or there abouts plywood instead. Of course you will have to consider how high your hills are and how much room you will have when the table is folded up against the wall. You may have to make a wall box for the table to fold up into. This opens some other considerations. If you are hanging this over your bed, you will have some clearance problems underneith the box when you are sleeping. The weight of the table will include not only the plywood and the framing wood, but the track and structures as well. If the table itself weighs for example 80 pounds of evenly distributed scenery and is hinged on the wall, you lifting weight will be 40 pounds from the down position and will decrease as you lift the table to its full upright or closed position. Don't forget to design a means of latching it when it is in the closed position. You wouldn't want it to give you a rude awakening in the middle of the night. You have good insight for using the bed posts for support. With proper wood framing underneath the plywood, you shouldn't have any problem with extending the table to a full 4X8'. You have to consider how close you are to the ceiling where the table is hinged to the wall to determine how far out your table can extend over the bed. <br /> <br />Ken, D&J Railroad, Stafford, VA
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