[competentone]

Have you considered using polycarbonate sheeting?

It's expensive, but if you are trying to bend it to the curve I can see in the picture, you can simply stress it to match that curve and anchor it in place.

The polycarbonate would give really good protection too in the event someone tumbled into it, or if it's being moved around much and is at risk of damage from handling.

It can be somewhat less resistant to scratching than some of the acrylic plastics, but there are coated polycarbonates that do have decent scratch resistance.

You can probably custom order one large piece to fit the whole curve (from the picture, I'm guessing it will take more than one 4 x 8 sheet to fit that opening).