It would have to be done in pieces do to the size i would love some dimension but its all on cost at the moment.
If cost is such a big issue, shrink the thing down to something that will fit on a single 5'x10' sheet of material for one.
How often are cars and trucks parked in those spaces? If its often, they will be blocking the view of half the
sign as currently sized anyway. That's if your town even allows a
sign that big on your building.
What kind of tools and skills do you possess? Can you cut something like out with a jigsaw? Is there a shop nearby with a CNC that is big enough to hold a 5'x10"
Why is the cost so crucial? Isn't this your shop and your pride and joy?