might be worth looking at these plans to see how they compare to yours and if you might like something better
https://www.google.com/search?q=plan...Address&ie=&oe=
talk to your local lumber yard to see if they can hook you up with a discount but in most cases your not spending enough money to get a reduced price
you can save a lot of money and labor by going with a simple tin roof over framework rather then using a plywood and shingle roof