After actually reading the paper, I see that you are correct, and they did indeed do a lot of work to paste all the 1000 bp fragments into a 1M bp sequence. It is certainly very cool. But like I said, they didn't "create new life from nothing," or even design a new genome from scratch. They just made a synthetic copy of an already-sequenced genome (with a few watermarks etc) and stuck it in a cell, and then showed that the cell worked with the new DNA. Cool stuff, but not exactly what some of the posters here seem to be imagining.