I used to install Satillite systems, and actually your dish is not suppose to be attached to your roof. It can be but is not recomended by either Dish or DirectTV. Anyway, you should be able to call them and have that Sat dish re-installed for free so you are getting the best possible signal that you can get. And without a line toner, and monitor your not going to get that yourself.
Your right about metal and expenses, now remember its also very sharp. You will want to have an over hang of 1 finger joint, and did you get drip endges to run along the face boards?
Have a fun day at it, and be safe.