Custom Template without logo, menus, etc.

I would like to create a custom template for individual image gallery pages. However, since these are pages for clients who wish to show these to their clients, I want to exclude any signs of my site’s identity, ie. page should have no logo, no menu, nothing except for the gallery.

Creating a custom template is fairly clear to me, but it seams I may need to either customize my header file or even create a separate, custom header file dedicated to this template.

Please advise…thanks!