Procedural cube generation

I'm trying to make a cube appear by prcedurally creating the mesh. I have got all the triangles in the right place, except for the last one! I'm trying to create a simple 1x1x1 cube - I've attempted all possible combinations for the last triangle - and none of them work. All produce a triangle the wrong way round. Anyway, here is the code:

 var newVertices : Vector3[];
 var newUV : Vector2[];
 var newTriangles : int[];
 var material : Texture2D;
 
 function Start () {
 var mesh : Mesh = new Mesh ();
 GetComponent(MeshFilter).mesh = mesh;
 mesh.Clear();
 //Actual creation.
 var p1 = Vector3(0,0,0);
 var p2 = Vector3(1,0,0);
 var p3 = Vector3(0,1,0);
 var p4 = Vector3(0,0,1);
 var p5 = Vector3(1,0,1);
 var p6 = Vector3(1,1,0);
 var p7 = Vector3(0,1,1);
 var p8 = Vector3(1,1,1);
 
 newVertices = new Array (p1,p2,p3,p4,p5,p6,p7,p8);
 
 newTriangles = [
 0,1,2,
 1,2,5,
 
 3,0,1,
 1,4,3,
 
 0,3,2,
 2,3,6,
 
 1,4,5,
 5,7,4,
 
 6,3,4,
 6,4,7,
 
 6,5,2,
 //problem line below
 7,6,5
 ];
 
 mesh.vertices = newVertices;
 mesh.triangles = newTriangles;
 mesh.uv = newUV;
 //I could UV map it, but I can't be bothered right now. Maybe later?
 mesh.RecalculateNormals();  
 mesh.RecalculateBounds();  
 mesh.Optimize(); 
 renderer.material.color = Color.gray;
 }