How to make a customer create a new product from a custom page and add it to the cart?

[kaamyi]

Hello there !

I am trying to develop on PS 1.6 a custom page where a customer could create a new product from a form and then add it to the cart.

Let's say for example, i am selling woodcrafts and i want my customers to fill a form where they need to specify the type of wood, dimensions, ...
Depending on these criterias, the price would be modified and it will create a "final" product that will be added to the customer's cart.

I know how i will develop the form and i think i can add the product to the cart with updateQty() from Cart.php but how do i instanciate my product from the data i get from the form? I am trying to search through all files but i can't seem to find where new products are instanciated from.

Thanks in advance for the help

Edited June 10, 2014 by kaamyi (see edit history)