[ART] Need help with the textures getting mixed up on .dae files

[richm0nkey]

Ok so the static object "zimmerman_ground.dae" features a nice hill and pathway good for an outdoor environments, BUT for some reason or another it is enclosed in a cube (First imgur link below) which makes it impossible to show a skybox for the level. So what I did was open the .dae in a 3d editor and delete the poly faces which made up the cube. Consequently the textures to the pathway get replaced making it difficult to see the pathway (2nd and 3rd imgur links below).

Showing the cube like enclosure. http://imgur.com/mpnBi5Y,PXvRWAh,gUf1c1h#2
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Good looking pathway but the cube looking enclosure is still there
http://imgur.com/mpnBi5Y,PXvRWAh,gUf1c1h#1
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Upon removing the cube enclosure the pathway textures chane and blend in with the outer textures
http://imgur.com/mpnBi5Y,PXvRWAh,gUf1c1h#0
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Need help please im kinda new at 3d editing with .dae things