Got a bit of a Christmas diy project going. Building out a wall with 3 inch battens and will fit with 12mm plasterboard. Wall will be partly tiled and have a small sink. Is the batten spacing ok? I am worried about the edges. Will the plasterboard be week at the sides and top and bottom. The space between batten and wall on the left is 15mm, space om the right is 90mm because of those pipes that can be moved. Also I have one cut side of plasterboardand one the orginal edge, do I need to tape this or something so it doesn't fall apart.