Get a wooden pallet and dismantle it. Hammer and nail bar will do this, be slow and gentle or you will break all the wooden lats, lots of nails holding the pallet together. Measure where the gate is going, at top and bottom. Lay out the wooden pallet lats and see how many will be needed, leave about an inch between all the lats. Cut pointed tops on all the lats, cut one and use as a template for the others, the arrow heads encourage rain to flow off the wood and make the gate last longer. Lay out the lats again and cut a top and bottom cross piece, make these slightly less than the width of the gate so as not to catch on the posts or fencing. Screw the lats to the cross pieces, then screw a diagonal support to the gate, now the gate is held together solidly. Sit the gate in its position, mark the hinges and attach them. Then sit the gate up on a bit of 2 x 2 and attach the hinges to the gatepost. Attach a bolt and you have a working gate.