Along with setting the TMPL files to 666 you may need to change the template directory folders to 777; set all of your index.html to 644.
Along with the showphoto.tmpl and showphoto.php you may need to modify the vb3.php file. Such as myself, I use custom Flash avatars on my forum and custom fields so I'll need to insert the codes to call them properly off of vB
If you have an example of a postbit layout you wish to have then supply a link or at least a screenshot of it; and what information you'd like to call from vB
. We'll then know what needs to be modified.