Artefact 6 Skybox update

Having now tested three different sky boxes, (one created by my tutor at Uni and the other two created by me) and none of which have worked. We came to the conclusion that because the sky boxes we created had lines joining each of the 6 images it wouldn't work well with the cube shape of the sky box, creating right angles every time a corner met. here i've tried editing an already made sky box and here is the outcome.. 

Artefact 6 Skybox test