Jumbo loaf?

As a college student I've taken to baking my own bread and I really enjoy it.  My family's favorite bread is the extra long Sunbeam brand, and I've been trying to replicate the same dimensions by using disposable aluminum pans.  I started baking loaves with an artisanal recipe that uses the following ingredients for a simple bread to be baked in a 9.87 x 5.00 x 2.25in pan:

3 1/2c bread flour

1 1/2tsp salt

1/4tsp instant yeast

12oz water

I've had relative success with this recipe in a smaller loaf pan, but I have been trying to bake a loaf that conforms more closely to the typical loaves that my family can buy in the store by using inexpensive, disposable aluminum pans that measure 11 3/4 x 5 1/2 x 3 1/4in, with no success.  What I'd like to know is:

1)  What steps do I need to take to ensure a fully risen jumbo loaf like this, and:

2)  What adjustments do I need to make to allow this to happen?