Greg,
I apologize for not seeing your post quick enough in order to reply to it.....as soon as I read it the first thing that poped into my head was ZONING, CHANGE OF USE, AND FIRE PROOFING OF THE STEEL... remember what my day job is
I can say from my little one man shop prospective is to keep overhead to an absolute minimum! IF you can get away with working in your current place do so for as long as you can until you can afford to BUY a place. If all else fails you now have an investment property. Maybe just maybe you could find a place that will allow you to rent out a small portion of it to a tenant in order to capture some income to pay for the mortgage...
Another way of increasing your current shop size is to outsource certain parts of your business: finishing, doors, drawers, etc....this way you can handle the more finicky stuff and have others do the "simple" stuff for you that would free up your time to do things like MARKETING....
One thing to keep reminding yourself now is woodworking is no longer a hobby it is a business and you need to find ways to get things done faster and better but at the same time MAKE money not spend it.....I try to remind myself that all the time