I'm looking to build 2 driveway gates. The total opening is 2.8 m, so each gate will be around 6 mm short of 1.4 m. Ideally the gates will be made up of a frame using 4 x 2 treated timber (stiles, top rail, middle rail and bottom, then cladded with 1 x 4 upright boards to match fence). They will...