I'm excited for you, John! Looks like a great little building in a beautiful setting.
I dream of having a studio with a space for my computers, printers, other hardware, another space for matting, framing, and supplies, and a nice gallery space in front -- with plumbing and conveniences, of course.
Until then, I'll soldier on in my 10x10 library/study/guestroom/studio/writing den. It swelters in summer and freezes in winter. I call it my 'single-story garret'. :-)
Keep us posted as you progress (pictures, please); I'd love to see your studio come together!