Opencart Customization

The project is about to modify an Opencart to sell BOOKS only. Needed modifications Add Product screen : SKU , EAN , UPC, JAN , ISBN , MPN fields will be deleted instead of them there will be, Author , Date Of Publish , Page (how many pages) , Language , ISBN , Type of Cover and Shelf for extra. We will write on which shelf the book is on at the store. There will be a section under Catalog called "Shelfs" from that area we will create Shelfs. While we add a book, we need to select the shelf as we select the category. In the Shelfs section we need to be able to See in which shelf how many books are there. and when we click on the shelf we need to see the list of books. its for the admin only. in front store there wont be a listing like this. There will be section under Catalog called "Authors" from that area we will Define Authors from there, we need to select the the Author as we select the Category or Shelf. Both in front store and admin area we need to be able to list the books belongs to an Author. Front store , in the product detail page all the new added fields must be seen by the visitors except Shelf info. when they click on the author name , books of that author will be listed.