Well, what you basically need to recreate the image.php functionally manually. To my knowledge that doesn't exists. You will understand that we can't do your work for you ;-)
I can give you a rough guide if you want to keep the normal image page.:
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[*]Create a theme page named e.g fullimage.php
[*]Then change all links to the full image to point to this page by appending a query for the image filename and albumname (e.g. `/page/fullimage/?image=<filename>&album=<albumname>`)
[*]Then on that page you have to create objects for the image and the album.
[*]Then use makeImageCurrent($imageobj) and you should be able to use all standard single image page functions here incl. the full image
[*]Now you would have to create prev/next links that mirror the ones above. You will need to get familiar with the object model to achieve this
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If you don't care for the normal image page you could also remove the image.php links from the album loop and use e.g. color box to point to the full image (that will work for the current page only naturally).