7.5.09__Some MINOR issues!

This is the beginning post of my new model that I am working on for my portfolio. I thought this would be an easy model to work on; pretty basic, but like everything that I do, it is getting complicated and I am having issues. I created this treasure chest in Maya. Did the UV's in UV Layout. Took the low poly model and added some extra edges to it so it will hold the shape in Mudbox. Exported to Mudbox. Then did the sculpting. Created the displacement map the way that everyone has been suggesting(32 bit floating point, RGB.tif). Afterwards, I created the shading network in Maya(again, using what I saw in the tutorials from "The Area,"(thanks Wayne). When I render I get all kinds of opacity, most of the model is see through, and the displacement map doesn't show up. I then converted the .tif file to a .map file, still nothing. I redid the displacement as an .exr. It shows up in Maya, with some opacity, but the map doesn't match up like the mudbox file, it looks inverted. So, I then reversed the normals of the model, still the same. So the last thing I did was use the .obj file from Mudbox(the Level 0 model), still the same result. I am thinking that there is something wrong with the displacement map(don't know what it is), and there might be an issue with the UV layout(its...driving me insane).