In my quest to learn the subject of adding new product types, I've created a duplicate of Product - General. Essentially I have copied and renamed the various files (for both admin & catalog). So all the files for my new product type are copies of those for Product - General with a unique name for respective directories, files, handler.

Everything seems to work fine except my 'Edit Layout' settings for the new product type. This is still being controlled by Product - General settings on the front-end catalog. I've spent quite a bit of time trying to track down the link to the product_type_layout table without success. Could someone point me in the right direction please?