I owned the land outright. During my previous time with a NASA subcontractor in Silicon Valley, I realized that rent was a key problem and if I didn't own the land, the entire idea would collapse.
Then I bought materials in cash and built a little cabin, which meant it was also paid for. I was entirely debt-free, which I regarded as essential (and still do).
I started a little garden and had lots of free time to think. The rest, as they say, is history. :)