LS-PrePost, SPH from solid mesh

I have an model with many solid meshed parts of non-simple shape.  I want to turn the parts into SPH parts.  However, I don't want to use the solid nodes for the SPH particles, because the nodes are very non-uniform in spacing.

I think that what I need to do is turn the surfaces of the solids into shell parts.  Then in SPH generation, I could use the shell volume method.  Is there a way to turn the surface of a solid mesh into a shell mesh?