I have a buddy who's in-laws run a maple syrup business. He said he gets maple syrup from them every year and decided to do this a few years ago. The first batch was good but a little hot. He has since perfected the recipe and methods and the latest one I tried was really good.if it's who i think it is th Maple Wine is awesome.
His friend, who is a brewer, decided to do a big batch of it. He has almost one barrel of it fermenting right now and it tastes spectacular. I'll email him and ask about his process.
Treat the syrup as honey, diluting to your target OG and follow the modern day (Ken Schramm of Schramm's Meads, he wrote the book) Mead process.