I ran a ligand-receptor prediction for a protein at Site-hound, and downloaded all the files.   Is there a Chimera tutorial which shows how to display the volume a selected cluster inside the protein as a wireframe mesh?   My guess is that the volume will be between all the AA residues in the given cluster(?)  

Once I can show the mesh, I will then go through the Autodock Vina run using ligands in a mol2 file, to sort their energies.