I am hoping someone could go through their workflow modeling in C4D and painting the UVs using Photoshop CS4’s 3D tool set for import into Unity.
Thanks! 
Why bother when you already have Bodypaint? Photoshops 3D painting is horrendous.
If you want to export to Photoshop you just export as an obj file, then import in Photoshop, that’s all there is to it, Photoshops manual covers the whole process. It’s much better to use Projectionman though or export the texture with UV’s outlined to paint in Photoshop if you prefer it’s tools, Photoshops 3D stuff is painful to use.