Custom Magento Product Type

I need a new Product type to work similar to Grouped Products but with the following requirements. we will call this new product type "SpecialGroup" within the requirements below... 1) Must have definable price to entire SpecialGroup (not an accumulation of sub products or percentage off) 2) The sub products of the SpecialGroup need to be hidden from the customer through the entire lifecycle of the order (product detail, checkout, order history, etc) 3) Pack slip in the back end needs to list out all of the individual parts that are in a SpecialGroup (will be used for filling orders). Including individual products of a SpecialGroup within a SpecialGroup (See requirement 5). 4) These SpecialGroups need to work as "simple products" do with "bundled products" 5) These SpecialGroups need to allow sub products to be other SpecialGroups (A SpecialGroup of various SpecialGroups)