Well, there is no load on a lazy jack. So I would say any line that is capable of retaining its properties being in the environment day in and day out should work. I just installed no-load external halyards for different uses and I chose doublebraid polyester rope. Sail Magazine says... "...1/4in to 3/8in prestretched polyester doublebraid for your lazyjack lines.". They also say do not use nylon. Does it have to be "marine grade"? I don't think so.
I followed this article to the letter when I built lazy jacks for a boat a few years ago and I will just pass it on to give you some guidance in your project.
Harken makes a very simple and efficient kit. It's gotten a bunch pricier -- but if you buy the same blocks, cleat, and line, it's very effective and does the job.
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