Step 1: Choose sleepers with as straight a grain as possible and no knots. Then mark the 200mm face of the sleepers into four lengthwise sections and cut them into 45mm x 100mm x 2.2m thick planks. Depending on the width of the table you will need to do this to three or four sleepers.
Step 2: On a work surface covered with polythene, assemble five 2.2m long planks for the table top on their edges. Glue using a two-pot epoxy glue (if you plan to leave the table outside in the weather) or a polyurethane glue if the table will be stored inside.
Step 3: Clamp the board together using clamps or ratchet tie-down strops. Allow to dry. Epoxy requires a minimum of 24 hours, longer if the weather does not co-operate.
Step 4: Once the glue is dry, plane and sand the top. Trim ends with a skill saw so they are tidy.
Step 5: For the trestle legs, work out the angle of the legs by setting out a string line at the proposed height of the table. Use a baton or straight edge to mimic the angle of the legs. Be sure the legs are on a slight angle, so the tops point inwards, as this makes the table much more stable. I decided on the appropriate angle by sight, using an angle much the same as the legs on a saw horse. Once you are happy with the leg angle, take a measurement using a builder's bevel and use this to set your mitre or skill saw.
Step 6: The legs are joined together with a brace at the top and bottom using a halving joint which is glued and screwed. To make a halving joint mark out where the timbers will be joined, then set the saw for half the depth of the timber (in my case 25mm). Make a series of cuts through the timber where the join has been marked out, then clean away the small slivers of timber and tidy with a file.
Step 7: Glue and screw the legs and braces together.
Step 8: To attach the legs, mark out the centre on the back of the table top then place the legs on, in the down position. Mark out the hinge position of each set of legs. Hold the legs in the upright position and screw on 200mm strap hinges.
Step 9: Screw one end of a piece of chain to the centre of the top brace, the middle of the chain to the centre of the bottom of the table top and the other end to the remaining top brace.
Step 10: Sand the table with a belt sander or sanding block then oil with linseed oil. Repeat the oiling process at least two or three times. Allow the table to cure thoroughly before leaving it in the weather. The table will need to be oiled from time to time as part of your summer maintenance to keep it looking its best and staying the distance.