Love your space... I'm doing the same exact thing right now, just scaled down a little. I am using most of my 1 car garage for my new darkroom.. 13' x 9'. Sink will be 10' long. I have to share space with the water heater, but that only takes 30" x 30" of the corner. (hot water won't take too long to warm up)
I found a 36" revolving door locally. (thanks kevin) The door makes a great babysitter for my kid... better than spongebob!
More pics to come...