My Viva Vivas design is focused on being able to invest in a small unit that can then be attached to others and grow organically costing under $20k per unit.
I have since upgraded the design with feedback from the folks in that thread.
My thoughts are that if no other project gets the ball rolling by 2018 I will move to Thailand and begin building a prototype unit with my own funds. Once one is built I will live in/on it while building a second one to see how well two connect together. Then start selling if it is viable.