Go to "Adminpage" > Go to "System" > Go to "Main Settings" >
At the end of the page you can put in the URL for the custompages you want to be panel free. Go to you custom page and copy the last in the URL /viewpage.php?page_id=13
they showed an example as Arcade ...But u can customize whatever u want ......Example u can use Korax or photogallery or page ......Manually include panel to the particular page or korax or photogallery ...
Or u can try custom control panel infusion , I didnt try that ...