Fifteen months ago, I set out to fulfill a lifelong ambition of building my own home using the latest green technology. On a $350,000 budget, several dreams came true. I installed a solar-powered boiler, a rooftop garden and a graywater recycling system. Other dreams were harder: A delivery truck damaged the recyclable foam panels meant to form the frame of my home, and I’m also considering suing my window contractor. But it will all be worth it when we move in next month. For those considering your own eco-haven, I offer four pieces of advice.