Add Colour/Texture to my model

Hello fellow Shapies.
I have made a few models over the past year in SketchUp that I have got printed in WSF which worked fine, but for however much I try I cannot get colour to work on my models.
I have followed the tutorial exactly and I just can't work it out.
I can get the texture applied in SketchUp & imported into MeshLab and can see it has worked, but I just get an unknown error. I have tried for hours in the past year but have just given up.
If I could get textures to work, I'd experiment more with Colour.

So can someone please help me add a texture to my model?
It's very simple, the model is ready and I believe printable in Sandstone.
I have saved it as a STL, DAE, WRL with Colour, Skp with & without Colour, along with the Image/texture I want applied all in this Zip file.
It measures roughly 100 x 54.5 x 33.7mm.

The Texture I want to be placed in the Middle sunk part in the centre, and fit to 100 x 62mm, or whatever fills it correctly.

I hope anyone can help me.

Also, if you can give me guidance as to how to texture models in SketchUp/Meshlab correctly then I'd much appreciate it.

Thanks in advance,
Tom.


EDIT: Sorted now with thanks to Cre83D.

if you add the texture file I could place it using maya+rhino.
I'm not a sketchup user so that's all I can do.

Hi rangio.
Cre83D helped me out and I can do it fine in Blender now.
Thanks anyway,
Tom.