I wont to create something big in my Magento: .O)
I wont to create and show different carts for different products.
a custumer has a 2 products in the cart 1. T-Shirt - default 2. T-Shirt - offer. (other attribute set in backend)
and he must get a 2 different carts and can execute a full process(give a personal info, pay etc. ) only for the product in this cart too.
with a attribute set i already can filter products in app\code\core\Mage\Checkout\Block\Cart.php.
1. must i create a extra modul in the app/code/local or its better to get a new modul \app\code\core\Mage\Checkout\.... Block\
I hope, there are a many magento profies and somebody already implemented something like that.