For the past couple years, I've been itching to go freelance and work for myself offering structural design services to the packaging industry. anything under 40" or so with no perimeters other then the sheet size. What's plagued my mind and kept me from moving down that road is the fact that I do not know of anyone doing this independently and being successful with it. I realize the trade can be pricey.... you have material costs, a plotter, and shipping costs that need to be paid to get samples to the clients.
Aside from the list above, what other variables come into play which may impact whether or not a freelance structural designer would be successful?
Is it supply and demand? Consistency of work available?