Slin... What ya got there? The terrain layout looks pretty good! Except, it looks like you have over-lapping or "Striping" at the edges. If that is "Striping, try changing the verticie count of your terrains so the count is as described in the manual:
"For avoiding unchunked mesh stripes, terrain_chunk should be a multiple of 8, and the number of terrain mesh squares in x and y direction should be a multiple of the terrain_chunk value."
In other words... a multiple of 8 plus 1... So, for example... 32 verticies in the x direction plus 1, 32 verticies in the y direction plus 1. So the terrains would be 33 x 33 = 1089 verticies total. Then set your chunk value at something like 8 or 16... Just experiment... That would make the terrain an even number of rows and the striping will go away and the game will run much faster and the edges will look better when textured while running it through the engine... Just my thoughts... And it does look good!