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At the moment I am trying to research planer sleds to see how viable an option that is.
Mine is just a couple of 4x2 hardwood rails with battens between them every foot or so along the length to hold them parallel and in line. Then the board I'm planing sits in between the rails, on top of the battens, with wedges as required to hold it flat. I've then got some long timber screws that come in from the sides and I screw them in until they bite to hold it all in place. A bit like someone's head in traction if you've ever seen that!