Multiple Tile Object Alignment

[Capt_Paradox]

So I have an image that I want to attach to the ground layer. It's pretty big so I know it isn't easy.

I broke my image up to 4 different sections and tried lining it up so this way they'd all meet.......

 

But they don't they all overlap each other and slightly offset.

 

Any suggestions or methods to those would be greatly helpful, hell I'd even do individual tiles (60x124 is it?) but I'm not quite sure how to set up an isometric grid so that is proving a tad difficult.

 

Thanks.