I think this is a link to the pattern.
which is indeed lovely. It should work like any pattern, as you say, when you have enough sts, you would start another trellis. There are often patterns like this that use different pattern sts rather than different colors and that's the way they work. The important thing is to watch the trellis pattern and make sure you keep it aligned. (The same holds if you knit from the top down: trellises disappear but you keep an eye on the pattern as established.) Why not try it out on some scrap yarn, saving your good yarn until you're confident about the pattern? For myself, I would graph out the pattern at the increases to see how to work them in.