I don't know if you are serious about building one of these tables, but if you are, use melamine playwood for the bed. I use them to build kitchen cabinets. It has a very slippery surface and doesn't scratch. You can buy the sheets (4x8) at home depot in Canada for around $45. Way cheaper and better than a quality sanded maple playwood at $75 a sheet. I would quess little powder would be required and home depot even cuts material for you. All you would need is a base and some maple rails. Try to find hard maple (sugar maple, rock maple) are other names for hard maple. You could hit this wood with a hammer and leave a very small mark. This would be perfect for rails.
I have never played on one, but deal with wood every day. If I build one these are the materials going into mine.