I added a variety of bumpers using rubber bands. They work well, but I want to get some thicker, colored rubber bands for visual appeal.
Up until this point I have been thinking about not putting a glass top on it. Yesterday my son was playing with it and he hurt his hand on one of the nails in the playing field. (He’s fine… it was just a very small cut) I have some spare acrylic sheets in my workshop and will use one of them for a removable top.