Thanks fellas  8)  
So that garden on the underside, I was looking at ref's and from different angles you always see different shades of colour, and I thought the only way Im gonna achieve that is to model an interior, but I want to keep the poly count low, so I have modelled in two inverted traingle shaped boxes, it adds 12 polys to the mesh as a total so it wont break the bank. I think this gives enough of the effect, without modelling interiors etc. So I now have the effect, but the textures I have in place are going to be changed or modified atleast at some point.