Cubecart 4 Changes

I am in the process of setting up a Cubecart 4 store with a difference, although I am using Cubecart I will not directly be selling things through it. I am going to use it as product directory, other peoples products. This means that I need some changes made to the 'Product Pages' - These changes would include removing the basket and stock buttons/details and replacing with a link to the developers website, it also means that within the 'Add a product' page in the admin it needs to be set-up so that the link is given when creating the product, it also needs to have a vendor option set so a vendor can be chosen when adding a product. Other changes needed are changing the categories box to show main category and then sub-categories under that in a list. Changes to the mail-list sign-up so visitors give their name and e-mail and that gets saved into database. There will also be some other minor changes.