Odds are most designs you will want to free hand rout would be small enough to print out and use carbon paper with. Since most printers can resize an image to fit multiple pages you are not limited to 8-1/2" x 11". This is by far the least expensive method to use.
You might try looking on Amazon for a projector, craigslist and ebay are other good places to find deals on about anything. I would use "overhead projector in the search engines.
"Living in the D" (this means Detroit!)
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